Update lint.yml (#76)

.github/workflows/lint.yml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.7
+      - name: Set up Python 3.8
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
       - name: Install pre-commit hook
         run: |
           python -m pip install pre-commit