Update CHANGELOG.
Update CHANGELOG.

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