* Periodically save timeline markers

This saves timeline markers immediately upon message arrival, but not more
than once every 5 minutes.

This does not change how the markers are saved on closing the window,
except that it avoids submitting them if there is no need for it.

* Use the Fetch API when possible instead of XHR on window unload

Bumps [kaminari](https://github.com/kaminari/kaminari) from 1.2.0 to 1.2.1. **This update includes a security fix.**
- [Release notes](https://github.com/kaminari/kaminari/releases)
- [Changelog](https://github.com/kaminari/kaminari/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kaminari/kaminari/compare/v1.2.0...v1.2.1

)

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Bumps [is-promise](https://github.com/then/is-promise) from 2.1.0 to 2.2.2.
- [Release notes](https://github.com/then/is-promise/releases)
- [Commits](https://github.com/then/is-promise/compare/v2.1.0...2.2.2

)

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Bumps [react-transition-group](https://github.com/reactjs/react-transition-group) from 2.5.2 to 2.9.0.
- [Release notes](https://github.com/reactjs/react-transition-group/releases)
- [Changelog](https://github.com/reactjs/react-transition-group/blob/master/CHANGELOG.md)
- [Commits](https://github.com/reactjs/react-transition-group/compare/v2.5.2...v2.9.0

)

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Bumps [eslint-import-resolver-node](https://github.com/benmosher/eslint-plugin-import) from 0.3.2 to 0.3.3.
- [Release notes](https://github.com/benmosher/eslint-plugin-import/releases)
- [Changelog](https://github.com/benmosher/eslint-plugin-import/blob/master/CHANGELOG.md)
- [Commits](https://github.com/benmosher/eslint-plugin-import/compare/v0.3.2...resolvers/node/v0.3.3

)

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Bumps [spdx-correct](https://github.com/jslicense/spdx-correct.js) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/jslicense/spdx-correct.js/releases)
- [Commits](https://github.com/jslicense/spdx-correct.js/compare/v3.1.0...v3.1.1

)

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Bumps [yaml](https://github.com/eemeli/yaml) from 1.9.2 to 1.10.0.
- [Release notes](https://github.com/eemeli/yaml/releases)
- [Commits](https://github.com/eemeli/yaml/compare/v1.9.2...v1.10.0

)

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Bumps [watchpack](https://github.com/webpack/watchpack) from 1.6.1 to 1.7.2.
- [Release notes](https://github.com/webpack/watchpack/releases)
- [Commits](https://github.com/webpack/watchpack/compare/v1.6.1...v1.7.2

)

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Bumps [node-releases](https://github.com/chicoxyzzy/node-releases) from 1.1.55 to 1.1.56.
- [Release notes](https://github.com/chicoxyzzy/node-releases/releases)
- [Commits](https://github.com/chicoxyzzy/node-releases/compare/v1.1.55...v1.1.56

)

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Bumps [compression-webpack-plugin](https://github.com/webpack-contrib/compression-webpack-plugin) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/webpack-contrib/compression-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/compression-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/compression-webpack-plugin/compare/v3.1.0...v4.0.0

)

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Bumps [tesseract.js](https://github.com/naptha/tesseract.js) from 2.0.0-alpha.16 to 2.1.1.
- [Release notes](https://github.com/naptha/tesseract.js/releases)
- [Commits](https://github.com/naptha/tesseract.js/compare/v2.0.0-alpha.16...v2.1.1

)

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Bumps [jsx-ast-utils](https://github.com/evcohen/jsx-ast-utils) from 2.2.3 to 2.3.0.
- [Release notes](https://github.com/evcohen/jsx-ast-utils/releases)
- [Changelog](https://github.com/jsx-eslint/jsx-ast-utils/blob/master/CHANGELOG.md)
- [Commits](https://github.com/evcohen/jsx-ast-utils/compare/2.2.3...2.3.0

)

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Bumps [memoize-one](https://github.com/alexreardon/memoize-one) from 5.0.4 to 5.1.1.
- [Release notes](https://github.com/alexreardon/memoize-one/releases)
- [Commits](https://github.com/alexreardon/memoize-one/compare/v5.0.4...v5.1.1

)

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Bumps [jest-leak-detector](https://github.com/facebook/jest/tree/HEAD/packages/jest-leak-detector) from 25.4.0 to 25.5.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v25.5.0/packages/jest-leak-detector

)

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Bumps [browserify-sign](https://github.com/crypto-browserify/browserify-sign) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/crypto-browserify/browserify-sign/releases)
- [Commits](https://github.com/crypto-browserify/browserify-sign/compare/v4.1.0...v4.2.0

)

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Bumps [events](https://github.com/Gozala/events) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/Gozala/events/releases)
- [Changelog](https://github.com/Gozala/events/blob/master/History.md)
- [Commits](https://github.com/Gozala/events/compare/v3.0.0...v3.1.0

)

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Bumps [yargs-parser](https://github.com/yargs/yargs-parser) from 13.1.1 to 13.1.2.
- [Release notes](https://github.com/yargs/yargs-parser/releases)
- [Changelog](https://github.com/yargs/yargs-parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yargs/yargs-parser/commits

)

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Bumps [sass](https://github.com/sass/dart-sass) from 1.26.3 to 1.26.5.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.26.3...1.26.5

)

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Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.4.2 to 3.5.3.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v3.4.2...v3.5.3

)

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Bumps [external-editor](https://github.com/mrkmg/node-external-editor) from 3.0.3 to 3.1.0.
- [Release notes](https://github.com/mrkmg/node-external-editor/releases)
- [Changelog](https://github.com/mrkmg/node-external-editor/blob/master/.release.json)
- [Commits](https://github.com/mrkmg/node-external-editor/compare/3.0.3...3.1.0

)

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Bumps [uuid](https://github.com/uuidjs/uuid) from 8.0.0 to 8.1.0.
- [Release notes](https://github.com/uuidjs/uuid/releases)
- [Changelog](https://github.com/uuidjs/uuid/blob/master/CHANGELOG.md)
- [Commits](https://github.com/uuidjs/uuid/compare/v8.0.0...v8.1.0

)

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Bumps [rack-attack](https://github.com/kickstarter/rack-attack) from 6.3.0 to 6.3.1.
- [Release notes](https://github.com/kickstarter/rack-attack/releases)
- [Changelog](https://github.com/kickstarter/rack-attack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kickstarter/rack-attack/compare/v6.3.0...v6.3.1

)

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Not sure why dependabot hasn't made a PR for this yet, but there is a new
version of wicg-inert, which does not try to dynamically insert styles
anymore when those styles already exist. This will get rid of some of the
CSP violation warnings we get since getting rid of 'unsafe-inline'.

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.83.0 to 0.84.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.83.0...v0.84.0

)

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Bumps [sidekiq-unique-jobs](https://github.com/mhenrixon/sidekiq-unique-jobs) from 6.0.21 to 6.0.22.
- [Release notes](https://github.com/mhenrixon/sidekiq-unique-jobs/releases)
- [Changelog](https://github.com/mhenrixon/sidekiq-unique-jobs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mhenrixon/sidekiq-unique-jobs/compare/v6.0.21...v6.0.22

)

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Bumps [aws-sdk-s3](https://github.com/aws/aws-sdk-ruby) from 1.64.0 to 1.66.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/master/gems/aws-sdk-s3/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/compare/v1.64.0...v1.66.0

)

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Bumps [pghero](https://github.com/ankane/pghero) from 2.4.2 to 2.5.0.
- [Release notes](https://github.com/ankane/pghero/releases)
- [Changelog](https://github.com/ankane/pghero/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/pghero/compare/v2.4.2...v2.5.0

)

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Bumps [rails](https://github.com/rails/rails) from 5.2.4.2 to 5.2.4.3.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v5.2.4.2...v5.2.4.3

)

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Bumps [puma](https://github.com/puma/puma) from 4.3.3 to 4.3.5.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/commits

)

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Bumps [capybara](https://github.com/teamcapybara/capybara) from 3.32.1 to 3.32.2.
- [Release notes](https://github.com/teamcapybara/capybara/releases)
- [Changelog](https://github.com/teamcapybara/capybara/blob/master/History.md)
- [Commits](https://github.com/teamcapybara/capybara/compare/3.32.1...3.32.2

)

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Bumps [electron-to-chromium](https://github.com/kilian/electron-to-chromium) from 1.3.432 to 1.3.448.
- [Release notes](https://github.com/kilian/electron-to-chromium/releases)
- [Changelog](https://github.com/Kilian/electron-to-chromium/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kilian/electron-to-chromium/compare/v1.3.432...v1.3.448

)

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Bumps [aws-sdk-core](https://github.com/aws/aws-sdk-ruby) from 3.95.0 to 3.96.1.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/master/gems/aws-sdk-core/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits

)

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Bumps [rspec-rails](https://github.com/rspec/rspec-rails) from 4.0.0 to 4.0.1.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/master/Changelog.md)
- [Commits](https://github.com/rspec/rspec-rails/compare/v4.0.0...v4.0.1

)

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Bumps [compressible](https://github.com/jshttp/compressible) from 2.0.17 to 2.0.18.
- [Release notes](https://github.com/jshttp/compressible/releases)
- [Changelog](https://github.com/jshttp/compressible/blob/master/HISTORY.md)
- [Commits](https://github.com/jshttp/compressible/compare/v2.0.17...v2.0.18

)

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Bumps [brakeman](https://github.com/presidentbeef/brakeman) from 4.8.1 to 4.8.2.
- [Release notes](https://github.com/presidentbeef/brakeman/releases)
- [Changelog](https://github.com/presidentbeef/brakeman/blob/master/CHANGES.md)
- [Commits](https://github.com/presidentbeef/brakeman/compare/v4.8.1...v4.8.2

)

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