Use psycopg2-binary in tox (#964)

Author: ulgens

tox.ini

@@ -27,7 +27,7 @@ setenv =
     DJANGO_SETTINGS_MODULE=django_test_settings
 deps =
     -e.[test]
-    psycopg2
+    psycopg2-binary
     django111: Django>=1.11,<2.0
     django20: Django>=2.0,<2.1
     django21: Django>=2.1,<2.2