Add Github Action to run unit tests

[pnuu]

This PR adds a Github Action that runs the unit tests. Non-functional Travis CI integration is remvoed.

[codecov[bot]]

Codecov Report

Merging #81 (0454b3a) into master (2e43255) will increase coverage by 0.19%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #81      +/-   ##
==========================================
+ Coverage   72.65%   72.85%   +0.19%     
==========================================
  Files          14       13       -1     
  Lines        2454     2461       +7     
==========================================
+ Hits         1783     1793      +10     
+ Misses        671      668       -3     

Impacted Files	Coverage Δ
pytroll_collectors/segments.py	89.58% <ø> (+0.15%)	:arrow_up:
pytroll_collectors/trigger.py	61.72% <100.00%> (ø)
pytroll_collectors/_version.py	41.57% <0.00%> (-1.03%)	:arrow_down:
pytroll_collectors/tests/test_segments.py	99.15% <0.00%> (+<0.01%)	:arrow_up:
pytroll_collectors/tests/test_trigger.py	92.42% <0.00%> (+0.23%)	:arrow_up:

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[pnuu]

There are plenty of cases where Thread.__init__(self) is used, but they should be something like super(NameOfThisClass, self).__init__(). As the test coverage is pretty poor and I have no intention on adding tests on this PR, I just fixed the one that caused the existing tests to fail.

[ghost]

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