Add a "Summary" headline to the changelog (#4077)

* merge changelog entries of pre releases

* modify changelog

* Update CHANGELOG.md

Co-authored-by: Lukas Bloder <[email protected]>

* review changes

* update changelog

* add auto ip change

* use previous self hosted version since we are no longer using is_exception_group

* more review comments

* add a headline to fix changelog parse error

---------

Co-authored-by: Lukas Bloder <[email protected]>

Author: adinauer

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## 8.0.0
 
+### Summary
+
 Version 8 of the Sentry Android/Java SDK brings a variety of features and fixes. The most notable changes are:
 
 - `Hub` has been replaced by `Scopes`