Merge pull request #50 from beauallison/beauallison/fix-treeview-sample

Fix tree view sample

tree-view-sample/README.md

@@ -6,7 +6,7 @@
 
 ## Running the example
 
-- Open this example in VS Code
+- Open this example in VS Code Insiders
 - `npm install`
 - `npm run compile`
 - `F5` to start debugging

tree-view-sample/package.json

@@ -7,6 +7,7 @@
 	"engines": {
 		"vscode": "^1.20.0"
 	},
+	"enableProposedApi": true,
 	"categories": [
 		"Other"
 	],

tree-view-sample/vscode.proposed.d.ts

@@ -639,3 +639,4 @@ declare module 'vscode' {
 		getParent?(element: T): ProviderResult<T>;
 
 	}
+}