Node-upgrade bug fixed

[jaypark25]

🎟️ Ticket(s): Closes https://github.com/ubc-biztech/serverless-biztechapp/issues/352

👷 Changes: Fixed spacing and wrote into serverless.common.yml

💭 Notes: Any additional things to take into consideration.

Wait! Before you merge, have you checked the following:

• [ ] Serverless tests are passing (Check travis build logs, CI is currently broken)
• [ ] PR is has approving review(s)