Update gradle.properties

gradle.properties

@@ -1,5 +1,5 @@
 # Version number: Major.Minor.SubMinor (e.g. 3.3.0)
-jmeVersion = 3.8.0
+jmeVersion = 3.9.0
 
 # Leave empty to autogenerate
 # (use -PjmeVersionName="myVersion" from commandline to specify a custom version name )