Update core package

jupyterlab/package.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "@jupyterlab/application": "^0.9.0",
     "@jupyterlab/application-extension": "^0.9.0",
-    "@jupyterlab/apputils": "0.9.0",
+    "@jupyterlab/apputils": "^0.9.0",
     "@jupyterlab/apputils-extension": "^0.9.0",
     "@jupyterlab/codeeditor": "^0.9.0",
     "@jupyterlab/codemirror": "^0.9.0",