Bump version to v2.3.0 RC

Author: Gagi2k

plugin.cfg

@@ -11,7 +11,7 @@ EMAIL=dominik.holland@googlemail.com
 # The version of your plugin - important if you would like to write an
 # upgrade script. Use a correct syntax, which is supported by LoxBerry:
 # More info: http://www.loxwiki.eu/x/LYG3AQ
-VERSION=2.3.0
+VERSION=2.3.0 RC
 
 # Short name and prefered subfolder of your Plugin (do not use blanks - they
 # will be filtered - and use lowercase only)! Used for script names in