Update ruby-simplecov to 0.19.0.
0.19.0 (2020-08-16)
==========
## Breaking Changes
* Dropped support for Ruby 2.4, it reached EOL
## Enhancements
* observe forked processes (enable with SimpleCov.enable_for_subprocesses).
See [#881](https://github.com/simplecov-ruby/simplecov/pull/881), thanks
to [@robotdana](https://github.com/robotdana)
* SimpleCov distinguishes better that it stopped processing because of a
previous error vs. SimpleCov is the originator of said error due to
coverage requirements.
## Bugfixes
* Changing the `SimpleCov.root` combined with the root filtering didn't
work. Now they do! Thanks to
[@deivid-rodriguez](https://github.com/deivid-rodriguez) and see
[#894](https://github.com/simplecov-ruby/simplecov/pull/894)
* in parallel test execution it could happen that the last coverage result
was written to disk when it didn't complete yet, changed to only write it
once it's the final result
* if you run parallel tests only the final process will report violations of
the configured test coverage, not all previous processes
* changed the parallel_tests merging mechanisms to do the waiting always in
the last process, should reduce race conditions
## Noteworthy
* The repo has moved to https://github.com/simplecov-ruby/simplecov -
everything stays the same, redirects should work but you might wanna
update anyhow
* The primary development branch is now `main`, not `master` anymore. If
you get simplecov directly from github change your reference. For a while
`master` will still be occasionally updated but that's no long term
solion.
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