try to install trtools within CI

.github/workflows/tests.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pytest pytest-cov
+          pip install pytest pytest-cov trtools
       - name: Test with pytest
         run: python -m pytest --cov=. --cov-report term-missing --doctest-modules --junitxml=junit/test-results-${{ matrix.python-version }}.xml
       - name: Upload pytest test results