Simplify unless macro now that we have "!"
Simplify unless macro now that we have "!"

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