Match passing test with warnings

"1 passed, 1 warning" wasn't matched before when there was a deprecation
warning.

Newer Django versions warn about the removal of `django.conf.urls.url` 
in favor of `django.urls.re_path` but Django 1.11 is also tested against 
and doesn't support `re_path` yet.

Author: jnns

tests/test_fixtures.py

@@ -616,7 +616,7 @@ class Migration(migrations.Migration):
     )
 
     result = django_testdir.runpytest_subprocess("-s")
-    result.stdout.fnmatch_lines(["* 1 passed in*"])
+    result.stdout.fnmatch_lines(["* 1 passed*"])
     assert result.ret == 0