Add reference to fixed issue (653)
## 5.4.0 (June 14th 2020)
### New features
-- [PR #654](https://github.com/rqlite/rqlite/pull/654): Allow number of Join attempts and Join interval to be specified at startup.
+- [PR #654](https://github.com/rqlite/rqlite/pull/654): Allow number of Join attempts and Join interval to be specified at startup. Fixes [issue #653](https://github.com/rqlite/rqlite/issues/653).
## 5.3.0 (May 13th 2020)
