add test for `mix help --names`
add test for `mix help --names`

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