Added publish command to prevent a wrong publish

Author: Jonatan Salas

package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "build-demo": "cross-env NODE_ENV=production babel-node ./tools/build-demo.js",
     "build-lib": "cross-env NODE_ENV=production babel-node ./tools/build-lib.js",
+    "publish": "npm run build-lib && npm publish",
     "start": "cross-env NODE_ENV=development babel-node ./demo/Server.js",
     "test": "mocha ./test --compilers js:babel-register",
     "coverage": "babel-node ./node_modules/.bin/isparta cover _mocha"