Fix conflicting migrations in users app.

Author: akatsoulas

…rs/migrations/0016_auto_20170329_0414.py …rs/migrations/0018_auto_20170502_0346.pymozillians/users/migrations/0016_auto_20170329_0414.py renamed to mozillians/users/migrations/0018_auto_20170502_0346.py mozillians/users/migrations/0016_auto_20170329_0414.py renamed to mozillians/users/migrations/0018_auto_20170502_0346.py

@@ -7,7 +7,7 @@
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('users', '0015_auto_20170323_1202'),
+        ('users', '0017_auto_20170404_0448'),
     ]
 
     operations = [