Prepare for studio 0.5.20 release (#9)

Author: markus-moser

composer.json

@@ -17,7 +17,7 @@
   "prefer-stable": true,
   "minimum-stability": "dev",
   "require": {
-    "pimcore/studio-ui-bundle": "^0.4.30 || ^1.0"
+    "pimcore/studio-ui-bundle": "^0.5.20 || ^1.0"
   },
   "require-dev": {
   },