bundle install
bundle exec -- ruby a.rb PATH_TO_LOCAL_GIT_REPOSITORY
% bundle exec -- ruby a.rb ../../Microsoft/vscode
2017-02-01 80.0
2017-03-01 70.77167019027485
2017-04-01 75.20427404148334
2017-05-01 67.32583454281567
2017-06-01 65.35244922341697
2017-07-01 63.319764812302125
2017-08-01 68.74797538062845
2017-09-01 69.12803300468498
2017-10-01 66.24936558957876
2017-11-01 65.66468253968254
2017-12-01 63.53051164371919
2018-01-01 66.8059535179879
2018-02-01 62.81294452347084
2018-03-01 58.160856935366745
2018-04-01 53.0701644596861
2018-05-01 57.97035232003249
2018-06-01 56.442857142857136
2018-07-01 58.22365393465255
2018-08-01 57.801258509975725
2018-09-01 56.6387170302833
2018-10-01 53.293992984507454
2018-11-01 50.96608126160764
2018-12-01 55.33890276461976
2019-01-01 54.33514582303509
2019-02-01 53.956497129457425
2019-03-01 56.644566623544634
2019-04-01 56.419823957137396
2019-05-01 57.217602541343545
2019-06-01 55.46761523640136
2019-07-01 56.65539547192002
2019-08-01 53.228221742260615
2019-09-01 57.9453828038491
2019-10-01 60.481339379141964
2019-11-01 58.04409517572583
2019-12-01 67.73616412213741