Update CHANGELOG
Update CHANGELOG

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