Remove prepublish we don't need it.

Author: sammarks

package.json

@@ -18,7 +18,6 @@
   ],
   "scripts": {
     "build": "tsc --emitDeclarationOnly && babel src --out-dir lib --extensions \".ts,.tsx\"",
-    "prepublish": "npm run build",
     "type-check": "tsc --noEmit",
     "lint": "tslint --project .",
     "test": "jest"