Disable fail-fast on GitHub workflow.

Author: HexDecimal

.github/workflows/python-package.yml

@@ -12,6 +12,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.6', '3.7', '3.8', '3.9']
+      fail-fast: false
 
     steps:
     - uses: actions/checkout@v2