Update CHANGELOG for 8.0.0 release
-# 8.0.0, in progress
+# 8.0.0, 2018-09-20
## Added
* Metrics can be forwarded over gRPC using veneur-proxy (and Consul). Thanks, [noahgoldman](https://github.com/noahgoldman) and [Quantcast](https://github.com/quantcast)!
