Removes py2.7 urlparse import (#168)

* Fixes #167 - Removes py2.7 urlparse import

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dj_database_url.py

@@ -1,11 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import os
-
-try:
-    import urlparse
-except ImportError:
-    import urllib.parse as urlparse
+import urllib.parse as urlparse
 
 try:
     from django import VERSION as DJANGO_VERSION