Bug fix: match monaco-editor version with @nteract/monaco-editor (#322)

Opening notebook (which contains code cell), then "Items"-> document editor is broken. Our JsonEditor component will hang at `monaco.editor.create()`.

Matching the `monaco-editor` version with `@nteract/monaco-editor` fixes it.

I looked into using one, but we cannot rely nteract, because it does not get loaded if notebook isn't enabled. Forcing nteract to use ours (if at all possible) isn't a good idea, since their code is tuned to their version.

For now, we'll have to keep the versions in sync.

package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "dependencies": {
     "@azure/cosmos": "3.9.0",
-    "@azure/cosmos-language-service": "0.0.4",
+    "@azure/cosmos-language-service": "0.0.5",
     "@jupyterlab/services": "6.0.0-rc.2",
     "@jupyterlab/terminal": "3.0.0-rc.2",
     "@microsoft/applicationinsights-web": "2.5.9",
@@ -66,7 +66,7 @@
     "jquery-ui-dist": "1.12.1",
     "knockout": "3.5.1",
     "mkdirp": "1.0.4",
-    "monaco-editor": "0.15.6",
+    "monaco-editor": "0.18.1",
     "object.entries": "1.1.0",
     "office-ui-fabric-react": "7.134.1",
     "p-retry": "4.2.0",
@@ -115,7 +115,7 @@
     "@types/prop-types": "15.5.8",
     "@types/puppeteer": "3.0.1",
     "@types/q": "1.5.1",
-    "@types/react": "16.9.49",
+    "@types/react": "16.9.56",
     "@types/react-dom": "16.0.7",
     "@types/react-notification-system": "0.2.39",
     "@types/react-redux": "7.1.7",