Add python 3.10 to GitHub Actions (#863)

.github/workflows/pythonapp.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [2.7, 3.6, 3.7, 3.8, 3.9]
+        python-version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10"]
 
     steps:
     - uses: actions/checkout@v2

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added 'show_featured_artists.py' to 'examples'.
 * Expanded contribution and license sections of the documentation.
 * Added `FlaskSessionCacheHandler`, a cache handler that stores the token info in a flask session.
+* Added Python 3.10 in GitHub Actions
 
 ### Fixed