update to 2.0.0 (#204)

* update to 2.0.0 and add package-lock

* remove package.json

package.json

@@ -17,6 +17,6 @@
   "author": "GitHub",
   "license": "CC0-1.0",
   "devDependencies": {
-    "electron": "^1.8.4"
+    "electron": "^2.0.0"
   }
 }