Add MIX_GIT_FORCE_HTTPS system environment var
Add MIX_GIT_FORCE_HTTPS system environment var

elixir-lang/elixir,michalmuskala/elixir,kimshrier/elixir,antipax/elixir,ggcampinho/elixir,pedrosnk/elixir,kelvinst/elixir,lexmag/elixir,joshprice/elixir,beedub/elixir,pedrosnk/elixir,ggcampinho/elixir,gfvcastro/elixir,kelvinst/elixir,gfvcastro/elixir,lexmag/elixir,antipax/elixir,kimshrier/elixir,beedub/elixir