Bump main version number

gradle.properties

@@ -1,7 +1,7 @@
 # Version number used for plugins, only 3 numbers (e.g. 3.1.3)
 jmeVersion = 3.5.2
 # Version used for application and settings folder, no spaces!
-jmeMainVersion = 3.4
+jmeMainVersion = 3.5
 # Version addition pre-alpha-svn, Stable, Beta
 jmeVersionTag = stable
 # Increment this each time jmeVersionTag changes but jmeVersion stays the same