docs: correct heading size for contributing

lpm0073 · lpm0073 · commit af2eb25b615f · 2023-12-08T15:17:15.000-06:00
diff --git a/README.md b/README.md
@@ -136,7 +136,7 @@ SECURE_LOGGER_SENSITIVE_KEYS = [
 SECURE_LOGGER_LOG_LEVEL = 'DEBUG'
 ```
 
-### Contributing
+## Contributing
 
 Pull requests are welcomed and encouraged!
 
