Prepare the release notes for the v0.5.2 release

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

RELEASE_NOTES.md

@@ -2,12 +2,10 @@
 
 ## Summary
 
-<!-- Here goes a general summary of what this release is about -->
+This version focus on some bug fixes and final polishing of v0.5.x.
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
-
 ### Cookiecutter template
 
 - If your replay file contains a `_extensions` key, you should remove it, as you most likely want to use the extensions declared by the repo-config cookiecutter template you are upgrading to, otherwise you could get errors about missing extensions.
@@ -16,8 +14,6 @@
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
-
 ### Cookiecutter template
 
 - Generated project's dependencies were bumped.
@@ -44,8 +40,6 @@
 
 ## Bug Fixes
 
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->
-
 ### Cookiecutter template
 
 - Properly label `conftest.py` files.