How to update Epic status when Story is in moved from "To-Do" to "In-Progress" WITHOUT any plugins

[Smit Srivastava]

What I am looking for is - when someone starts working on the stories under the Epic -> story goes from TO-DO to IN-PROGRESS then EPIC automatically goes from TO-DO to IN-PROGRESS.

I saw many solutions all are using one or the other plugins but I can't have any plugins installed for this task. 

I narrowed down to two solution but apparently these also don't work for me. I am on JIRA cloud.

option 1: Under post function I found “update issue custom field” which can be used for my purpose. But it gives me error unable to update. Someone on web mentioned, this comes under “Jira Misc workflow extension” which used to be pre-installed and free but now it's paid service under the JIRA suite utilities. Is that the reason it's not working for me?

Option 2: Create  listener and write small web service to update the Epic status. But I am not sure how to do the same in cloud. 

Any help is appreciated!