Fix GitHub action (#49)

Author: BlueManCZ

.github/workflows/actions.yaml

@@ -1,5 +1,5 @@
 name: Black, Flake, Tests
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -16,7 +16,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          sudo apt-get install libgirepository1.0-dev
+          sudo apt-get install libcairo2-dev libgirepository1.0-dev
           python -m pip install --upgrade pip
           pip install pipenv
           pipenv install --dev