Fix lint issues

recipe-server/normandy/recipes/api/v2/views.py

@@ -181,4 +181,4 @@ class ApprovalRequestViewSet(viewsets.ReadOnlyModelViewSet):
     def close(self, request, pk=None):
         approval_request = self.get_object()
         approval_request.close()
-        return Response(status=status.HTTP_204_NO_CONTENT)
+        return Response(status=status.HTTP_204_NO_CONTENT)

recipe-server/normandy/recipes/tests/api/v2/test_api.py

@@ -1,5 +1,3 @@
-import hashlib
-
 import pytest
 from rest_framework.reverse import reverse