ci: Install coveralls package

Author: jpmckinney

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           cache: pip
           cache-dependency-path: setup.py
-      - run: pip install .[test]
+      - run: pip install .[test] coveralls
       - run: pytest --cov agateremote
       - env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}