Bump version to 2.0-beta-02

Change-Id: Id3de8402273365d07f042ac8e546baa8960177a9
diff --git a/build.gradle b/build.gradle
index f593f80..56cf4ab 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,3 +3,6 @@
         dirs("libs")
     }
 }
+
+// Zentrale Projektversion für korapxmltool
+version = '2.0-beta-02'