The 1.1.3 release of Linkerd is mostly focused on improving our HTTP/2 support,
including better support for gRPC.  Linkerd now supports automatic retries in
HTTP/2 for retryable requests.

* HTTP/2
  * Cleaned up spurious errors messages in the Linkerd log output.
  * Added a number of gRPC response classifiers that use the `grpc-status` code
    to determine if the response was successful and if it should be retried.
    See [the docs](https://linkerd.io/config/1.1.3/linkerd/index.html#grpc-response-classifiers) for details.
  * Added support for failure accrual and automatic retries to HTTP/2.
  * Fixed a memory leak related to messages with only a headers frame.
* Istio
  * Added HTTP/2 support to the Istio integration: the `io.l5d.k8s.istio`
    identifier can now be used in H2 router configs.
  * Added support for HTTPRedirect Route Rules.
* The Linkerd and Namerd admin sites can now be configured to require HTTPS.