[PT] Add filter/2 to Enum lesson (#1480)
[PT] Add filter/2 to Enum lesson (#1480)


doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school