adding python 3.10 [tag & CI] (#428)

* adding python 3.10

Author: Borda

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: [2.7, 3.5, 3.7, 3.8, 3.9]
+        python-version: ["2.7", "3.5", "3.7", "3.8", "3.9", "3.10"]
 
     steps:
      # Checkout the repo.

setup.py

@@ -71,6 +71,7 @@
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
 
         'Operating System :: OS Independent',
         'Operating System :: POSIX',