Remove publish-latest as it is no longer maintained

Author: gaearon

package.json

@@ -11,8 +11,7 @@
     "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",
-    "postpublish": "publish-latest"
+    "prepublish": "npm run lint && npm run clean && npm run test && npm run build"
   },
   "repository": {
     "type": "git",