zAppBuild 3.13.0 version file update (#666)

Signed-off-by: Dennis Behm <dennis.behm@de.ibm.com>

Author: dennis-behm

version.properties

@@ -2,7 +2,7 @@
 # delivered via the public github repository 
 # https://github.com/IBM/dbb-zappbuild.
 # Helps to understand from which version a copy was taken.
-zappbuild_baseVersion=3.12.0
+zappbuild_baseVersion=3.13.0
 
 # use this property to add you own version suffix to indicate 
 # contributed enhancements and your own revisions