* prep for 0.2.0-alpha.4

* [http server]: reuse port unix only

* skip `reuse_port` on socket

* refactor benches

* start

* fix build: enable `raw value` feature serde_json

* start

* port it

* make tests compile

* fix bench

* fix bench

* introduce builder pattern

* tweaks

* remove unused code

* cleanup

* [http server]: configure tcp socket manually.

The major reason is to provide a uniform API with the WebSocket server to return the local address.

* remove unused deps

* [examples]: remove needless sleep

* chore: add docs and refactor noise.

* Update types/src/jsonrpc/error.rs

* http server use constants

* prep for client release.

* fix nits

* add changelogs

* Update http-client/src/lib.rs

Co-authored-by: David <[email protected]>

* address grumbles: one changelog

* 0.2.0-alpha

* revert rust2018 lint

Co-authored-by: David <[email protected]>

* update http example

* ungeneric crate

* update dependencies

* [client]: add WebSocket client again.

* [deps]: remove needless dev dependencies

* nits: forgot to commit new files

* [ws client]: `send_text` instead of `send_binary`

This is temporary fix to work with the `server` which assumes that
`WebSocket` resonses are `text`

* chore: add a bunch of more logging

* [ws]: port tests but some are failing.

* chore: fmt

* [server API]: expose `fn local_addr` as public API.

* [tests]: make them less ugly by using `127.0.0.1:0`

* fix: a bunch of compiler warnings.

* [api]: uniform naming, `bind -> new` in transport.

* [websocket server]: reply when deserial fails

When the server receives an request with invalid JSON
`-32700, Parse error shall be returned`

* chore: fmt

* [tests]: fix remaining tests

* [websocket server]: support `binary` and `text`

* [ws server]: fix bug in subscription response.

`.await` was missing in ...