Output improvements

[weph]

Hey,

I had just installed the action and let it run. It failed with "Running Infection failed! Check error output above" but there wasn't any output. I've added stdout/err to the exception message similar to how Sebastian is doing it. After changing it I discovered that the cause of the error was the -j 4 I copy/pasted from the README. It actually has to be -j4 or -j=4. I changed that in the docs and tests. It doesn't really matter for the latter but I like to keep it straight.

I also print the output of infection so the developer can see the results.

[coveralls]

Pull Request Test Coverage Report for Build 530275454

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 8 of 8 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.3%) to 96.0%

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Totals
Change from base Build 523919552:	1.3%
Covered Lines:	24
Relevant Lines:	25

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💛 - Coveralls

[shochdoerfer]

@weph awesome! Thanks for your contribution. I had on my list to improve the output as well, so thanks for saving my time ;)

[shochdoerfer]

@weph Release 0.2.0 published!