add shipit command

Author: ihadeed

package.json

@@ -8,7 +8,8 @@
     "build": "rm -rf aot dist && ngc",
     "test": "echo \"Error: no test specified\" && exit 1",
     "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0",
-    "postchangelog": "git commit -am \"chore(): update changelog\""
+    "postchangelog": "git commit -am \"chore(): update changelog\"",
+    "shipit": "npm run build && npm publish"
   },
   "repository": {
     "type": "git",