Mention operators on the README.
Mention operators on the README.

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