Reference implementation for Bech32 and segwit addresses.
Since this implementation wasn't in a place that was easy to use for Python programmers I took it from from https://github.com/rustyrussell/lightning-payencode and published on GitHub and on PyPI.
The original version of this package is probably the one at https://github.com/sipa/bech32/tree/master/ref/python, but apparently Rusty Russel commented out the 90-length limit of bech32-encoded stuff so it could be used for Lightning invoices. Let's keep that change.
pip install bech32
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