Get rid of if_value/3 helper function in URI
Get rid of if_value/3 helper function in URI

Mentioned in https://github.com/elixir-lang/elixir/commit/49e577506573246437334bdbdda0a8e4721d0981#commitcomment-15941688.

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