Added support for 1440p (#498)

test/pinchflat/downloading/quality_option_builder_test.exs

@@ -68,7 +68,7 @@ defmodule Pinchflat.Downloading.QualityOptionBuilderTest do
     end
 
     test "includes quality options" do
-      resolutions = ["360", "480", "720", "1080", "2160", "4320"]
+      resolutions = ["360", "480", "720", "1080", "1440", "2160", "4320"]
 
       Enum.each(resolutions, fn resolution ->
         resolution_atom = String.to_existing_atom(resolution <> "p")