Fix broken tests because of repository deletion

The repo https://github.com/Rapptz/discord.py was removed by the owner.
In order for this test to work, we need a package which has a setup
with version and extras in it.

tests/unit/test_utils.py

@@ -57,7 +57,7 @@ DEP_PIP_PAIRS = [
                 "extras": ["voice"],
             }
         },
-        "https://github.com/Rapptz/discord.py/archive/async.zip#egg=[voice]",
+        "https://github.com/oz123/dparse/zipball/master#egg=dparse[pipenv]"
     ),
     (
         {