Fix #36: Disable Python3.5 test

This change add test on 3.6 and 3.10.

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [2.7, 3.5, 3.7, 3.9]
+        python: [2.7, 3.6, 3.7, 3.9, 3.10]
 
     steps:
       - uses: actions/checkout@v2