ihaskell_labextension for JupyterLab 1.0.0

If we remove the upper version bound for the jupyterlab/services
dependency, then ihaskell_labextension works fine with JupyterLab 1.0.0.

ihaskell_labextension/package.json

@@ -34,7 +34,7 @@
     "@jupyterlab/apputils": "0.17.2 - 2.0.0",
     "@jupyterlab/docregistry": "0.17.1 - 2.0.0",
     "@jupyterlab/notebook": "0.17.1 - 2.0.0",
-    "@jupyterlab/services": "^3.0.1",
+    "@jupyterlab/services": ">=3.0.1",
     "@phosphor/disposable": "^1.1.2"
   },
   "devDependencies": {