Add build with Python 3.10

.github/workflows/main.yml

@@ -10,10 +10,11 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - 3.6
-          - 3.7
-          - 3.8
-          - 3.9
+          - '3.6'
+          - '3.7'
+          - '3.8'
+          - '3.9'
+          - '3.10'
 
     steps:
     - name: Clone Repository

tox.ini

@@ -4,6 +4,7 @@ envlist =
     py37
     py38
     py39
+    py310
 
 [gh-actions]
 python =
@@ -11,6 +12,7 @@ python =
     3.7: py37
     3.8: py38
     3.9: py39
+    3.10: py310
 
 [testenv]
 deps = -rrequirements.txt