Bump version to v3.00-rc3

Change-Id: Icea8ef9644c52415361169b52560bb84c601df8f
diff --git a/build.gradle b/build.gradle
index d2fd2f1..5c44ae4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,4 +5,4 @@
 }
 
 // Zentrale Projektversion für korapxmltool
-version = '3.00-rc2'
+version = '3.00-rc3'