Updating API Changelog to add /distribution/{name}/json endpoint

Signed-off-by: Nishant Totla <nishanttotla@gmail.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/api/version-history.md

@@ -23,6 +23,7 @@ keywords: "API, Docker, rcli, REST, documentation"
 * `POST /build/` now (when not silent) produces an `Aux` message in the JSON output stream with payload `types.BuildResult` for each image produced. The final such message will reference the image resulting from the build.
 * `GET /nodes` and `GET /nodes/{id}` now returns additional information about swarm TLS info if the node is part of a swarm: the trusted root CA, and the
  issuer's subject and public key.
+* `GET /distribution/(name)/json` is a new endpoint that returns a JSON output stream with payload `types.DistributionInspect` for an image name. It includes a descriptor with the digest, and supported platforms retrieved from directly contacting the registry.
 
 ## v1.29 API changes