Update extension display name

Author: felicio

package.json

@@ -1,8 +1,8 @@
 {
   "name": "JavaScriptSnippets",
-  "description": "Code snippets for JavaScript in ES6 syntax",
+  "description": "JavaScript (ES2015) code snippets",
   "version": "1.5.0",
-  "displayName": "JavaScript (ES6) code snippets",
+  "displayName": "JavaScript (ES2015) code snippets",
   "publisher": "xabikos",
   "icon": "images/javascript.png",
   "license": "SEE LICENSE IN LICENSE",