Merge branch 'update_changelog' into 'master'

Update changelog

See merge request !240

CHANGELOG-EE

 v 7.5.0
   - Added an ability to check each author commit's email by regex
-  - Added an abulity to restrict commit authors to existing Gitlab users
+  - Added an ability to restrict commit authors to existing Gitlab users
   - Add an option for automatic daily LDAP user sync
   - Added git hook for preventing tag removal to API
   - Added git hook for setting commit message regex to API