Add py3.8, py3.9 token to setup.py

Fixes: #5113

<!-- Provide a general summary of your proposed changes in the Title field above -->

### Description
Add py3.8 and py3.9 tokens to setup.py

### Checklist
<!-- go over following points. check them with an `x` if they do apply, (they turn into clickable checkboxes once the PR is submitted, so no need to do everything at once)

-->

This pull request is:

- [ ] A documentation / typographical error fix
	- Good to go, no issue or tests are needed
- [x] A short code fix
	- please include the issue number, and create an issue if none exists, which
	  must include a complete example of the issue.  one line code fixes without an
	  issue and demonstration will not be accepted.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.   one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
	- please include the issue number, and create an issue if none exists, which must
	  include a complete example of how the feature would look.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.

**Have a nice day!**

Closes: #5115
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5115
Pull-request-sha: 5ae662f1ec0d89a16a03fe60d6f12712d0d21398

Change-Id: I1313df9bd117b1356c1d06d588e8e04a07ba4e39

1 files changed, 2 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index c520857a2..cb117d787 100644
--- a/setup.py
+++ b/setup.py
@@ -162,6 +162,8 @@ def run_setup(with_cext):
             "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",
             "Topic :: Database :: Front-Ends",