Update simplecov requirement to ~> 0.16.0

[dependabot-preview]

Updates the requirements on simplecov to permit the latest version.

Changelog

Sourced from simplecov's changelog.

0.16.0 (2018-03-15)

Enhancements

• Relax version constraint on docile, per SemVer
• exception that occurred on exit is available as exit_exception! See #639 (thanks thomas07vt)
• Performance: processing results now runs from 2.5x to 3.75x faster. See #662 (thanks BMorearty & eregon)
• Decrease gem size by only shipping lib and docs

Bugfixes

• (breaking) Stop handling string filters as regular expressions, use the dedicated regex filter if you need that behaviour. See #616 (thanks yujinakayama)
• Avoid overwriting the last coverage results on unsuccessful test runs. See #625 (thanks thomas07vt)
• Don't crash on invalid UTF-8 byte sequences. (thanks BMorearty)

0.15.1 (2017-09-11) (changes)

Bugfixes

• Filter directories outside SimpleCov.root that have it as a prefix. See #617 (thanks jenseng)
• Fix standard rails profile rails filter (didn't work). See #618 (thanks jenseng again!)

0.15.0 (2017-08-14) (changes)

Enhancements

• Ability to use regex filters for removing files from the output. See #589 (thanks jsteel)

Bugfixes

• Fix merging race condition when running tests in parallel and merging them. See #570 (thanks jenseng)
• Fix relevant lines for unloaded files - comments, skipped code etc. are correctly classified as irrelevant. See #605 (thanks odlp)
• Allow using simplecov with frozen-string-literals enabled. See #590 (thanks pat)
• Make sure Array Filter can use all other filter types. See #589 (thanks jsteel)
• Make sure file names use Simplecov.root as base avoiding using full absolute project paths. See #589 (thanks jsteel)

0.14.1 2017-03-18 (changes)

Bugfixes

• Files that were skipped as a whole/had no relevant coverage could lead to Float errors. See #564 (thanks to stevehanson for the report in #563)

Commits

• 24b05de Version bump to 0.16.0 👯
• 35679d1 0.16.0 Changelog update
• cfc6ff0 Merge pull request #670 from colszowka/limit-gem-files
• 1378af6 No need to ship our specs and cukes :)
• 449d293 Merge pull request #669 from BMorearty/ignore-invalid-byte-sequences
• fbd3c3e Merge pull request #668 from colszowka/even-faster-no_cov_line
• c3d4936 SimpleCov is built also on Ruby 2.5
• e26ae2f Refactor code to ignore invalid byte sequences.
• 3dc01d6 TIL there is an o modifier doing the same thanks to eregon
• 67bd66a Don't crash on invalid UTF-8 byte sequences.
• Additional commits viewable in compare view

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