chore(npm): add publish script

Author: michaelbazos

package.json

@@ -6,6 +6,7 @@
  "start": "ng serve",
  "lib:copy-assets": "cp README.md LICENSE dist/angular-feather",
  "lib:build": "ng build angular-feather --prod && npm run lib:copy-assets",
+ "lib:publish": "npm publish dist/angular-feather",
  "test": "ng test",
  "lint": "ng lint"
  },