fix

.github/workflows/main.yml

@@ -14,14 +14,12 @@ jobs:
   test:
     name: Set up python matrix for testing
     runs-on: ubuntu-18.04
-    with:
-      python-version: 3.7
     steps:
       - uses: actions/checkout@master
       - name: Setup Python Matrix
         uses: actions/setup-python@v1
         with:
-          python-version: ${{ python-version }}
+          python-version: 3.7
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip