Improve summary for StringIO
Improve summary for StringIO

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