setting common script hook for npm and yarn

Author: raul-casallas

package.json

@@ -17,7 +17,6 @@
   },
   "homepage": "https://github.com/modzy/sdk-javascript#readme",
   "scripts": {
-    "prepare": "babel src --out-dir=dist",
     "prepack": "babel src --out-dir=dist",
     "docs": "jsdoc -c jsdoc.json",
     "build": "babel src --out-dir=dist",