Bump commander from 4.1.0 to 4.1.1

Bump puppeteer from 2.0.0 to 2.1.0

Merge pull request #1744 from hypothesis/dependabot/npm_and_yarn/babel-plugin-mockable-imports-1.7.0

Bumps [@babel/core](https://github.com/babel/babel) from 7.8.3 to 7.8.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.8.3...v7.8.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.8.3 to 7.8.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.8.3...v7.8.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 16.38.3 to 16.43.0.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](https://github.com/octokit/rest.js/compare/v16.38.3...v16.43.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [babel-plugin-mockable-imports](https://github.com/robertknight/babel-plugin-mockable-imports) from 1.6.0 to 1.7.0.
- [Release notes](https://github.com/robertknight/babel-plugin-mockable-imports/releases)
- [Changelog](https://github.com/robertknight/babel-plugin-mockable-imports/blob/master/CHANGELOG.md)
- [Commits](https://github.com/robertknight/babel-plugin-mockable-imports/compare/v1.6.0...v1.7.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.0.7 to 2.0.8.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](https://github.com/cure53/DOMPurify/compare/2.0.7...2.0.8)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [puppeteer](https://github.com/puppeteer/puppeteer) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/puppeteer/puppeteer/releases)
- [Commits](https://github.com/puppeteer/puppeteer/compare/v2.0.0...v2.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [commander](https://github.com/tj/commander.js) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tj/commander.js/compare/v4.1.0...v4.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Chrome extension did not upload correctly, bumping version to repeat the travis build

Improved tag editor (Part 2/2)

- Fix add new tag bug in Edge
- Remove tag-editor’s Chrome hack fix to limit suggestions to 20
- Add ARIA 1.1 Combobox  a11y model to TagEditor

Add accessibility unit test using axe-core

"default" is the default name for an a11y scenario unless one is
specified.

Remove the global react/display-name lint suppression for the
src/sidebar/components/test directory with individual line-level
suppressions.

The reason for having a global rule wasn't obvious when looking at
.eslintrc and there aren't that many occurrences.

Improve handling of text in RTL languages

This enables axe-core tests which depend on CSS rules being available to
work, such as checking that elements have sufficient color contrast.

Remove obsolete references to shallow rendering

`checkAccessibility` calls often violate this rule because the `content`
key is assigned a function which returns an element, but is not actually
a component.

Add Datalist component (Part 1/2)

- Use as a replacement for the native <datalist> tag
- Fix UI differences between Chrome, FF, Safari and Edge with respect to the <datalist>
- Fix performance issues experienced in Chrome when used with <datalist>
- Allow for future enhanced customization of list including substring highlighting that <datalist> could not do

Add infrastructure for running a11y tests using axe-core and add an
initial set of tests for existing components. A small number of
components (3) fail these checks. These tests have been temporarily
skipped so that we can incrementally fix them later.

One trivial issue with an un-labeled link in `LoggedOutMessage` was fixed by
adding a `title` attribute.

We replaced use of Enzyme's shallow rendering for component unit tests
some time ago in https://github.com/hypothesis/client/pull/1470.

Add eslint-plugin-jsx-a11y to the lint configuration

Bump cross-env from 6.0.3 to 7.0.0

Bump fetch-mock from 8.3.1 to 8.3.2

Bump sinon from 8.1.0 to 8.1.1

This helps detect accessibility errors in markup as part of `make lint`.

Flag the current set of known errors with a `FIXME-A11Y` comment and
suppress them temporarily, so that we can fix them incrementally while guarding
against new errors.

Part of #1727

Bump codecov from 3.6.1 to 3.6.2

Bump mocha from 7.0.0 to 7.0.1

Bump autoprefixer from 9.7.3 to 9.7.4

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.7.3 to 9.7.4.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/autoprefixer/compare/9.7.3...9.7.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>