mrkd doesn't like non-ASCII characters in ubuntu:18.04, used for
repro-builds. This is the easiest way to sidestep this issue until we
deprecate the old ubuntu version.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: doc: Epic documentation rewrite: each now lists complete and accurate JSON output, tested against testsuite.
Fixes: #2679
Changelog-Added: JSON-RPC: New `multiwithdraw` command to batch multiple onchain sends in a single transaction. Note it shuffles inputs and outputs, does not use BIP69.