Updated workflow file

.github/workflows/pythonpackage.yml

@@ -9,24 +9,30 @@ jobs:
       max-parallel: 4
       matrix:
         python-version: [3.7]
+
     steps:
     - uses: actions/checkout@v1
+
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
         python-version: ${{ matrix.python-version }}
+
     - name: Install dependencies
       run: |
-        apt-get install libgit2-dev -y
+        sudo apt-get update
+        sudo apt-get install libgit2-dev -y
         python -m pip install --upgrade pip
         pip install -r requirements.txt
+
     - name: Lint with flake8
       run: |
         pip install flake8
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+
     - name: Test with pytest
       run: |
         pip install pytest