Add changelog entry

Author: jackwilsdon

CHANGELOG.md

@@ -13,6 +13,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Add `NewMiddleware` function in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp`. (#2964)
 - Add the new `go.opentelemetry.io/contrib/instrgen` package to provide auto-generated source code instrumentation. (#3068, #3108)
 - The `go.opentelemetry.io/contrib/exporters/autoexport` package to provide configuration of trace exporters with useful defaults and envar support. (#2753)
+- New `WithSpanType` option in `go.opentelemetry.io/contrib/instrumentation/github.com/go-kit/kit/otelkit`. (#4044)
 
 ### Fixed