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Update for 2020: Headless Firefox, Semistandard, NYC report, Coveralls

== Update to Karma 5 ==

* Introducing Headless Firefox.

  Use Headless Firefox by default instead of Headless Chrome.
  This tends to be more stable, especially in development environments
  that use Docker where Chrome has root/sandboxing requirements that
  allow non-trivial "last mile" configuration, causing things like
  karma, grunt and puppeteer to always fail by default and thus create
  a barrier to entry. Ref https://github.com/puppeteer/puppeteer/issues/5505.

* karma-cli no longer needed.

== Update ESLint and use Semistandard ==

* Introducing Semistandard

  Remove custom ESLint configuration and use Semistandard wrapper.
  Less configuration to fiddle with. It just works. Set any overrides
  local to the individual JS files. No more opinionated or indirect per-repo
  or per-directory overrides. Follow the standard™!

* Switch excludes from package.json to .eslintignore file.

* Switch .eslintrc from YAML to JSON, and add a `.json` file extension.

* Update test files to use modern ES6 syntax.

== Combined code coverage reports! ==

* Introducing NYC.

  Use NYC to generate code coverage from the Node.js test run.

  And, more importantly, use NYC to generate a combined code coverage report
  from both the Node.js and web browser test runs. This is possible by
  configuring karma-coverage in karma.conf.js to save the internal JSON file,
  without a 'subdir'. (This matches what the `nyc` command does for Node.js)
  These two are then combined by the `nyc report` command.

* Introducing Coveralls.

  Switch from Codecov to Coveralls <https://coveralls.io/>.

4 of 4 branches covered (100.0%)

Branch coverage included in aggregate %.

10 of 10 relevant lines covered (100.0%)

4.2 hits per line