Changelog entry for http.statusCode.
# ChangeLog
+### New Features
+
+* Attribute `http.statusCode` has been added to external span events
+ representing the status code on an http response. The attribute will be
+ included when added to the ExternalSegment in one of these three ways:
+
+ 1. Using
+ [`NewRoundTripper`](https://godoc.org/github.com/newrelic/go-agent/v3/newrelic#NewRoundTripper)
+ with your http.Client
+ 2. Including the http.Response as a field on your
+ [`ExternalSegment`](https://godoc.org/github.com/newrelic/go-agent/v3/newrelic#ExternalSegment)
+ 3. Using the new
+ [`ExternalSegment.SetStatusCode`](https://godoc.org/github.com/newrelic/go-agent/v3/newrelic#ExternalSegment.SetStatusCode)
+ API to set the status code directly
+
+ To exclude the `http.statusCode` attribute from span events, update your
+ agent configuration like so, where `cfg` is your [`newrelic.Config`](https://godoc.org/github.com/newrelic/go-agent/v3/newrelic#Config) object.
+
+ ```go
+ cfg.SpanEvents.Attributes.Exclude = append(cfg.SpanEvents.Attributes.Exclude, newrelic.SpanAttributeHTTPStatusCode)
+ ```
+
## 3.3.0
### New Features
