When using type google.protobuf.Timestamp, BloomRPC maps this to an object, e.g.:

"create_time": {
  "seconds": "1562723637",
  "nanos": 928852400
}

However, the Google API Design Guide specifies that the string representation should be RFC 3339 format, e.g. "2014-07-30T10:43:17Z"

This JSON mapp

JSON Lines is another JSON serialization format that can send a stream of JSON data.
Currently, Armeria only supports JSON Text sequences format using [JsonTextSequences](https://github.com/line/armeria/blob/67c25e242e8604331bdd8696a97d26604eb114af/core/src/main/java/com/linecorp/armeria/server/streaming/JsonTextSequences.java

Is your feature request related to a problem? Please describe.
I want to use ETCD's ttl, and I noticed that there are some lease methods (LeaseGrant and so on) exposed from client, but I can't figure out how to use them.

Describe the solution you'd like
Add some usage examples in README.md.

Thank you for your creating the great client again.

`[info] ProtocolUtilTest:
[info] generateProtocol
[info] - should generate a protocol with valid format
[WARN] [10/18/2017 10:55:52.375] [pool-7-thread-6-ScalaTest-running-PredictorFSMTest] [akka://EngineFSMTest/user/$$d] Engine is unavailable, not possible to perform event any message in state Unavailable/NoModel
[INFO] [10/18/2017 10:55:52.736] [pool-7-thread-1-ScalaTest-running-GenericHttpA

Based on the protobuf specification here

Proto file that not have syntax = "proto3"; on the first line will be treated as 'proto2' syntax. And so if it has first line syntax = "proto2"; its clean that its proto2 syntax.

• [Proto2 repeated numeric](https://developers.google.com/protocol-buffers/docs/proto#specifying_fi

During tab completion currently documentation is shown as additional information.

However when displaying the reply messages no documentation is shown in those messages.

It would be nice to also show documentation there.

maybe make it possible to disable via config or cli arg