Bump version to 3.00-rc2

Change-Id: Ib6d79f20bb354cc30f6e3417937b6a8bf387d421
diff --git a/build.gradle b/build.gradle
index 9c4f3d0..d2fd2f1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,4 +5,4 @@
 }
 
 // Zentrale Projektversion für korapxmltool
-version = '2.99'
+version = '3.00-rc2'