Upgrade simplecov to version 0.20.0

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ simplecov (~> 0.16.1 → ~> 0.20.0) · Repo · Changelog

Release Notes

0.20.0

The "JSON formatter" release. Starting now a JSON formatter is included by default in the release. This is mostly done for Code Climate reasons, you can find more details in this issue.
Shipping with so much by default is sub-optimal, we know. It's the long term plan to also provide simplecov-core without the HTML or JSON formatters for those who don't need them/for other formatters to rely on.

Enhancements

• simplecov_json_formatter included by default (docs), this should enable the Code Climate test reporter to work again once it's updated
• invalidate internal cache after switching SimpleCov.root, should help with some bugs

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 11 commits:

• prep 0.20.0 release
• Improve performance of lines classifier
• Improve performance by removing `!!` checking bool
• Minor fixups in test code
• Add feature tests for JSON formatter
• Add documentation for JSON formatter
• Add ability to set formatters using an env var
• Invalidate coverage_path cache for updating root
• Some minor gem updates
• Clarify when to require simplecov for acceptance testing
• minor updates

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[depfu]

Closed in favor of #83.