Fix `lightning-block-sync` builds below rustc 1.56 due to serde_json
[rust-lightning] / lightning-invoice /
drwxr-xr-x   ..
-rw-r--r-- 28 .gitignore
-rw-r--r-- 1409 Cargo.toml
-rw-r--r-- 450 README.md
drwxr-xr-x - fuzz
drwxr-xr-x - src
drwxr-xr-x - tests