Set action to install with -e flag.

Author: simlist

.github/workflows/testing-and-coverage.yml

@@ -20,7 +20,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install pytest pytest-cov beautifulsoup4
-        pip install ./
+        pip install -e ./
     - name: run-tests
       run: |
         pytest --cov=src/pyluach tests/