bump major version

This has to be done before release because our staging registry is
essentialy a continusous deployment pipeline that makes use of the
major and minor version of master.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "loopback-explorer",
-  "version": "1.8.2",
+  "version": "2.0.0-0",
   "description": "Browse and test your LoopBack app's APIs",
   "main": "index.js",
   "scripts": {