Use nil_container type where applicable
Use nil_container type where applicable

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