Add support to python 3.10

Author: jairhenrique

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "pypy3"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "pypy3"]
         os: [ubuntu-latest, macos-latest, windows-latest]
         exclude:
           - os: macos-latest

setup.py

@@ -58,6 +58,7 @@ def get_packages(package):
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Utilities",
     ],

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 3.4.0
 envlist =
-    py{36,37,38,39,py3}-{base,cryptography-only,pycryptodome-norsa,compatibility},
+    py{36,37,38,39,310,py3}-{base,cryptography-only,pycryptodome-norsa,compatibility},
     lint
 skip_missing_interpreters = True
 
@@ -11,6 +11,7 @@ python =
     3.7: py37-{base,cryptography-only,pycryptodome-norsa,compatibility}
     3.8: py38-{base,cryptography-only,pycryptodome-norsa,compatibility}
     3.9: py39-{base,cryptography-only,pycryptodome-norsa,compatibility}
+    3.10: py310-{base,cryptography-only,pycryptodome-norsa,compatibility}
     pypy3: pypy3-{base,cryptography-only,pycryptodome-norsa,compatibility}
 
 [testenv:basecommand]
@@ -56,7 +57,7 @@ extras =
     compatibility: {[testenv:compatibility]extras}
 
 [testenv:lint]
-basepython = python3.8
+basepython = python3.10
 skip_install= True
 deps =
     flake8
@@ -69,7 +70,7 @@ commands =
 
 
 [testenv:lintfix]
-basepython = python3.8
+basepython = python3.10
 skip_install= True
 deps =
     isort