don't need to install unittest

.github/workflows/build.yaml

@@ -19,7 +19,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 unittest
+        pip install flake8
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Install bapsicle as module
       run: |