fix(package.json): Remove postinstall task

Author: trodrigues

package.json

@@ -27,7 +27,6 @@
     "vendor:node": "rimraf vendor-node && mkdirp vendor-node && babel node_modules/axios/lib/ --out-dir vendor-node/",
     "vendor:browser": "rimraf vendor-browser && mkdirp vendor-browser && babel node_modules/axios/dist/axios.js --out-file vendor-browser/axios.js",
     "browser-coverage": "npm run test:cover && opener coverage/lcov-report/index.html",
-    "postinstall": "npm run vendor:node && npm run vendor:browser",
     "prepublish": "in-publish && npm run build || not-in-publish",
     "postpublish": "npm run docs:publish && npm run clean",
     "pretest": "standard lib/*.js && standard lib/**/*.js",