Fixing the CI

.github/workflows/test.yml

@@ -21,6 +21,8 @@ jobs:
         uses: actions/setup-python@v1
         with:
           python-version: '3.x'
+      - name: Install the SFML and QT5.
+        run: sudo apt-get update && sudo apt-get install --yes libsfml-dev qt5-default
       - name: Install Gcovr
         run: python -m pip install --upgrade pip gcovr
       - name: Update G++