Add secrets to GHA workflow (#877)

.github/workflows/pythonapp.yml

@@ -9,7 +9,9 @@ jobs:
     strategy:
       matrix:
         python-version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10"]
-
+    env:
+      SPOTIPY_CLIENT_ID: ${{ secrets.SPOTIPY_CLIENT_ID }}
+      SPOTIPY_CLIENT_SECRET: ${{ secrets.SPOTIPY_CLIENT_SECRET }}
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}