Update build-and-test.yml

Added module build to workflow dependencies.

.github/workflows/build-and-test.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest
+        pip install flake8 pytest build
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
         sudo -H python -m pip install beancount
         sudo apt-get install python3-beancount