Add changelog entry

Author: SamBarker

CHANGELOG.md

@@ -15,6 +15,7 @@
 
 #### New Features
 * Fix #6066: Add support for `v1.APIVersions` in KubernetesClient
+* Fix #6143: Expands the HTTP interceptor API to include a call back for failed connection attempts
 
 #### _**Note**_: Breaking changes
 * Check detailed migration documentation for breaking changes in [7.0.0](./doc/MIGRATION-v7.md)