Add HEREDOC to README.
Add HEREDOC to README.

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