Allowlist stackoverflow.com

stackoverflow.com is a pain in the ass - links work from a browser, but
get a 403 when awesomebot tries to verify them.

Signed-off-by: Joe Block <[email protected]>

Author: unixorn

.github/workflows/awesomebot.yml

@@ -20,4 +20,4 @@ jobs:
         fetch-depth: 0
     - uses: docker://dkhamsing/awesome_bot:latest
       with:
-        args: /github/workspace/README.md --allow-ssl --allow 500,501,502,503,504,509,521 --allow-dupe --allow-redirect --request-delay 1 --white-list https://github,https://img.shields.io,https://twitter.com,https://medium.com
+        args: /github/workspace/README.md --allow-ssl --allow 500,501,502,503,504,509,521 --allow-dupe --allow-redirect --request-delay 1 --white-list https://github,https://img.shields.io,https://twitter.com,https://medium.com,https://stackoverflow.com