Minor CHANGELOG improvements
Minor CHANGELOG improvements

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