Also convert String.to_integer tests to use ===
Also convert String.to_integer tests to use ===

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