* Bump jsonrpc & generate clients.
* Initial version of JSON-RPC client.
* Re-wort
* Remove spurious `#[derive(Encode, Decode)]`
They did not compile, since `Encode` and `Decode` are deliberately not
implemented for `usize`.
Fixes#2742.
* Re-write rpc-client example.
* Update to jsonrpc=12.0.0
* Remove unnecessary import
* Bump version.
* Revert version bump.
* Bump again.
Tomasz Drwięga