Bump version to v3.2.1

Change-Id: Iae2bff2ed3c3384c029427d647d6c07849165a8e
diff --git a/build.gradle b/build.gradle
index 4cf7adc..f2bb849 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,4 +5,4 @@
 }
 
 // Zentrale Projektversion für korapxmltool
-version = '3.2.0'
+version = '3.2.1'