module: run go mod tidy && go mod vendor

vendor/github.com/btcsuite/btcutil/bech32/README.md

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+bech32
+==========
+
+[![Build Status](http://img.shields.io/travis/btcsuite/btcutil.svg)](https://travis-ci.org/btcsuite/btcutil)
+[![ISC License](http://img.shields.io/badge/license-ISC-blue.svg)](http://copyfree.org)
+[![GoDoc](https://godoc.org/github.com/btcsuite/btcutil/bech32?status.png)](http://godoc.org/github.com/btcsuite/btcutil/bech32)
+
+Package bech32 provides a Go implementation of the bech32 format specified in
+[BIP 173](https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki).
+
+Test vectors from BIP 173 are added to ensure compatibility with the BIP.
+
+## Installation and Updating
+
+```bash
+$ go get -u github.com/btcsuite/btcutil/bech32
+```
+
+## Examples
+
+* [Bech32 decode Example](http://godoc.org/github.com/btcsuite/btcutil/bech32#example-Bech32Decode)
+  Demonstrates how to decode a bech32 encoded string.
+* [Bech32 encode Example](http://godoc.org/github.com/btcsuite/btcutil/bech32#example-BechEncode)
+  Demonstrates how to encode data into a bech32 string.
+
+## License
+
+Package bech32 is licensed under the [copyfree](http://copyfree.org) ISC
+License.