Merge rust-bitcoin#3662: backport: Re-export bech32 crate

6b9104f Re-export bech32 crate (Tobin C. Harding)

Pull request description:

  Backport rust-bitcoin#3657

  ---

  `rust-bitcoin` is a lot further from 1.0 than `bech32` is. We previously removed the re-export of `bech32` because we thought it might hold us up releasing `rust-bitcoin 1.0` but in hindsite this was incorrect.

  Having a public re-export of dependencies helps users keep their deps in sync with those in `rust-bitcoin` and is thus useful.

ACKs for top commit:
  apoelstra:
    ACK 6b9104f; successfully ran local tests

Tree-SHA512: 96fbadcdeb86601f69aab07625b65524aa4563f41304b091c62b198f222056cc25b2dab665bf4f95d157e50671ff4924fb0ba50208127a140eeaf61fb271cbe3

Author: apoelstra

bitcoin/src/lib.rs

@@ -64,6 +64,9 @@ pub extern crate base64;
 /// Bitcoin base58 encoding and decoding.
 pub extern crate base58;
 
+/// Re-export the `bech32` crate.
+pub extern crate bech32;
+
 /// Rust implementation of cryptographic hash function algorithms.
 pub extern crate hashes;