Added initial GH Action workflow

[mpontes]

Switch to Github Actions from Travis CI.

[codecov[bot]]

Codecov Report

Merging #90 (3cf787e) into master (e88a5eb) will increase coverage by 0.03%. The diff coverage is n/a.

:exclamation: Current head 3cf787e differs from pull request most recent head e68449c. Consider uploading reports for the commit e68449c to get more accurate results

@@             Coverage Diff              @@
##             master      #90      +/-   ##
============================================
+ Coverage     78.35%   78.38%   +0.03%     
  Complexity      338      338              
============================================
  Files            49       49              
  Lines          1275     1277       +2     
  Branches        153      153              
============================================
+ Hits            999     1001       +2     
  Misses          222      222              
  Partials         54       54              

Impacted Files	Coverage Δ
...ovider/maxmind/reading/MaxmindLocationsParser.java	92.85% <0.00%> (-0.25%)	:arrow_down:
.../building/navigablemap/NavigableMapIpDatabase.java	84.37% <0.00%> (+0.50%)	:arrow_up:
...logy/dice/dicewhere/utils/ProtoValueConverter.java	88.88% <0.00%> (+3.17%)	:arrow_up:

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