Migrate from travis to github actions

[RomainGoussault]

Close #296

[codecov-io]

Codecov Report

Merging #298 (be1e94e) into master (8dc64c3) will increase coverage by 1.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #298      +/-   ##
==========================================
+ Coverage   63.63%   64.64%   +1.01%     
==========================================
  Files          13       13              
  Lines        2560     2594      +34     
==========================================
+ Hits         1629     1677      +48     
+ Misses        931      917      -14     

Impacted Files	Coverage Δ
mplc/splitter.py	96.29% <0.00%> (+0.04%)	⬆️
mplc/scenario.py	83.08% <0.00%> (+0.12%)	⬆️
mplc/dataset.py	86.03% <0.00%> (+0.24%)	⬆️
mplc/multi_partner_learning.py	69.56% <0.00%> (+0.28%)	⬆️
mplc/models.py	68.91% <0.00%> (+0.42%)	⬆️
mplc/corruption.py	80.41% <0.00%> (+0.73%)	⬆️
mplc/partner.py	91.11% <0.00%> (+1.50%)	⬆️
mplc/contributivity.py	23.29% <0.00%> (+1.80%)	⬆️

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