New comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/23650#issuecomment-661854367

Comment:
While you're at it, please add
```
changelog="https://raw.githubusercontent.com/matrix-org/synapse/develop/CHANGES.md"
```
below the `homepage` line so it's easier to track changes from one release to the next.