DOC: Mention the new discussion forum

Author: kernc

backtesting/__init__.py

@@ -32,9 +32,10 @@
 
 ## FAQ
 
-Potentially outdated answers to frequent and popular questions can be found on the
-[issue tracker](https://github.com/kernc/backtesting.py/issues?q=label%3Aquestion+-label%3Ainvalid).
-Please use the search.
+Some answers to frequent and popular questions can be found on the
+[issue tracker](https://github.com/kernc/backtesting.py/issues?q=label%3Aquestion+-label%3Ainvalid)
+or on the [discussion forum](https://github.com/kernc/backtesting.py/discussions) on GitHub.
+Please use the search!
 
 ## License