update Changelog

CHANGELOG.md

@@ -2,7 +2,12 @@
 `current version:` ![calver](https://img.shields.io/github/v/release/freifunk-dresden/ffdd-server?sort=semver)
 
 ## version 1.4.0rc2
-	- update bmxd to version 1.1 (fixes community gw selection)
+	- update bmxd to version 1.1
+    	- parameter changed/added
+    	- retrigger gw selection
+    	- fix community gw selection
+    	- disable bmxd debug traces (syslog)
+    	- change script to keep created container to regenerate deb-packages
 	- sysinfo: prevent synatax error then we use sh/dash
 
 ## version 1.4.0rc1