Add an if/else/end example for eex.
Add an if/else/end example for eex.

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