Add publish-latest to package.json

Author: gaearon

package.json

@@ -11,7 +11,8 @@
     "lint": "eslint .",
     "test": "mocha --compilers js:babel/register --recursive",
     "test:watch": "npm run test -- --watch",
-    "prepublish": "npm run lint && npm run clean && npm run test && npm run build"
+    "prepublish": "npm run lint && npm run clean && npm run test && npm run build",
+    "postpublish": "publish-latest"
   },
   "repository": {
     "type": "git",