Enabled eclipse bundling

releng/org.yakindu.sct.releng/promote-pom.xml

@@ -13,8 +13,8 @@
 		for distros is set -->
 
 	<properties>
-		<tycho.extras.version>0.21.0</tycho.extras.version>
-		<tycho-version>0.21.0</tycho-version>
+		<tycho.extras.version>0.20.0</tycho.extras.version>
+		<tycho-version>0.20.0</tycho-version>
 
 		<!-- scp settings for publishing udpdate site -->
 		<promotionTarget>luna/integration</promotionTarget>