Update master.yml

Author: jhavl

.github/workflows/master.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        python-version: [3.8, 3.9, 3.10]
+        python-version: [3.8, 3.9, '3.10']
 
     steps:
     - uses: actions/checkout@v2