circle: fix coveralls

Author: snarfed

.circleci/config.yml

@@ -38,7 +38,7 @@ jobs:
             python3 -m coverage run --include=oauth_dropins/webutil/handlers.py,oauth_dropins/webutil/models.py,oauth_dropins/webutil/util.py -m unittest discover -v -p 'test_*.py'
             kill %1
             python3 -m coverage html -d /tmp/coverage_html
-            if [ "$COVERALLS_REPO_TOKEN" != "" ]; then coveralls || true; fi
+            if [ "$COVERALLS_REPO_TOKEN" != "" ]; then python3 -m coveralls || true; fi
 
       - save_cache:
           key: venv-8-{{ .Branch }}-{{ checksum "requirements.txt" }}-{{ checksum "setup.py" }}