Add tests for fenced code blocks in IO.ANSI.Docs.
Add tests for fenced code blocks in IO.ANSI.Docs.

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