Describe new versioning in readme.md

Author: Lineflyer

Diff for: README.md

@@ -4,6 +4,6 @@ Script for Mozilla Firefox and Google Chrome browser to [send geocaches directly
 
 ## Version management
 
-Changes must be done on the `master` branch. Once the changes are validated and ready to release, they can be merged to the `release` branch. The script version number needs to be raised before that merge (it needs be be larger than the existing version number on `release`) to trigger a rollout automatically.
+Changes must be done on the `master` branch. Once the changes are validated and ready to release, they can be merged to the `release` branch. The script version number needs to be derived from the actual date of release and set accordingly in the scripts `@version` tag before that merge (it needs be be larger than the existing version number on `release`) to trigger a rollout automatically.
 
 The script download link on the [c:geo homepage](http://cgeo.org) as well as the update mechanism for the installed script directly targets the raw script on the `release` branch, which means after merging the changes to `release`, together with the required version number increase, users will see the update on the website and script hosts (e.g. Greasemonkey) will detect and notify users to update.