Remove psycopg2 version pin from tox.ini

PiDelport · blag · commit f8bcaf7ccbec · 2017-12-03T14:16:09.000-08:00
This matches the Travis config.
diff --git a/tox.ini b/tox.ini
@@ -13,4 +13,4 @@ deps =
     dj1.9: Django ~=1.9.0
     dj1.10: Django ~=1.10.0
 
-    psycopg2==2.6
+    psycopg2
