📝 Update release notes

docs/release-notes.md

@@ -1,5 +1,6 @@
 ## Latest changes
 
+* Fix usage of `custom_encoder` in `jsonable_encoder`. PR [#715](https://github.com/tiangolo/fastapi/pull/715) by [@matrixise](https://github.com/matrixise).
 * Fix invalid XML example. PR [710](https://github.com/tiangolo/fastapi/pull/710) by [@OcasoProtal](https://github.com/OcasoProtal).
 * Fix typos and update wording in deployment docs. PR [#700](https://github.com/tiangolo/fastapi/pull/700) by [@marier-nico](https://github.com/tiangolo/fastapi/pull/700).
 * Add note about dependencies in `APIRouter` docs. PR [#698](https://github.com/tiangolo/fastapi/pull/698) by [@marier-nico](https://github.com/marier-nico).