Update tested version to map.apps 4.20.0 in RELEASE.md

Author: Matthias Stein

RELEASE.md

@@ -1,4 +1,4 @@
-✅ Tested for map.apps 4.19.3 / Linie 4
+✅ Tested for map.apps 4.20.0 / Linie 4
 
 #### Release Notes
 - autogenerated SNAPSHOT-Release