Add missing changelog entries (#291)

Author: Nicoretti

doc/changes/unreleased.md

@@ -1,6 +1,18 @@
 # Unreleased
 
+## 🔧 Changed
+
+* Excluded pyupgrade from project check due to its destructive nature
+* Updated cookiecutter template
+    - removed obsolete template file `version.html`
+
+## 🐞 Fixed
+
+* Fixed syntax error in the `check.yml` template which resulted in an invalid workflow file
+
 ## 📚 Documentation
 
+* Fixed various documentation typos
 * Added a toolbox migration guide
 * Fixed version information in GitHub Actions reference
+* Updated the `pre-commit` related documentation