Update LICENSE to 2022
Note that we're BSD-MIT but some of the ccan modules are different licenses. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
ccan/opt is GPLv2, so the test-cli utils are GPLv2, but they're temporary. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>