Tidied up changelog
## 3.13.0
### Fixed
-* Replaced the NR AWS SDK V2 integration for the v3 agent with a new version that works. See the v3/integrations/nrawssdk-v2/example/main.go file for an example of how to use it.
+* Replaced the NR AWS SDK V2 integration for the v3 agent with a new version that works. See the v3/integrations/nrawssdk-v2/example/main.go file for an example of how to use it. Issues [#250](https://github.com/newrelic/go-agent/issues/250) and [#288](https://github.com/newrelic/go-agent/issues/288) are fixed by this PR. [#309](https://github.com/newrelic/go-agent/pull/309)
-* Fixes issue [#221](https://github.com/newrelic/go-agent/issues/221): grpc errors reported in code watched by `UnaryServerInterceptor()` or `StreamServerInterceptor()` now create error events which are reported to the UI with the error message string included.
+* Fixes issue [#221](https://github.com/newrelic/go-agent/issues/221): grpc errors reported in code watched by `UnaryServerInterceptor()` or `StreamServerInterceptor()` now create error events which are reported to the UI with the error message string included. [#317](https://github.com/newrelic/go-agent/pull/317)
* Fixes documentation in `GUIDE.md` for `txn.StartExternalSegment()` to reflect the v3 usage. Thanks to @abeltay for calling this to our attention and submitting PR [#320](https://github.com/newrelic/go-agent/pull/320).
