Add Python 3.8 & 3.9 as supported version (#442)

Since Py 3.8 & 3.9 is supported, we should update the identified, as it is shown on PIP and gives wrong impressions that Py 3.8 is not supported

Author: kaxil

.github/workflows/run-tests.yml

@@ -17,6 +17,10 @@ jobs:
             tox-env: py36
           - python-version: 3.7
             tox-env: py37,docs,readme,black
+          - python-version: 3.8
+            tox-env: py38
+          - python-version: 3.9
+            tox-env: py39
           - python-version: pypy3
             tox-env: pypy3
     steps:

setup.py

@@ -60,6 +60,8 @@ def readall(path):
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py27,py34,py35,py36,py37,pypy,pypy3,docs,readme,black
+envlist=py27,py34,py35,py36,py37,py38,py39,pypy,pypy3,docs,readme,black
 
 [testenv]
 deps=