And add a request schema for multifundchannel.
Changelog-Added: JSON-RPC: `fundchannel` and `multifundchannel` now take an optional `channel_type` parameter.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: JSON-RPC: `fundchannel`, `multifundchannel` and `fundchannel_start` now accept a `reserve` parameter to indicate the absolute reserve to impose on the peer.