Use GitHub actions for continuous integration (CI) #97
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Bye bye Travis CI, you've served us well.
Some of the functional tests only fail when executed by GitHub CI. The reason why GitHub actions shows this behavior is unclear at this point. It worked fine with Travis and still works fine when executed local on the command line. That's why I chose to skip the tests for now. If someones out there who ran into the same problem or even better, knows the answer, please let me know :).
This pull request builds on top of #94 and reactphp/reactphp#442.