Also change MIT/X11 to just MIT, since no distinction was intended. Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Extracted from bitcoin/bitcoin#12757 - Commit 8fd6af89a0c061d79bb3fd2ba704b61dcc2e9211
This includes a reformatted version of the Bech32 reference code (see https://github.com/sipa/bech32/tree/master/ref/c%2B%2B), with extra documentation.