Add extra reference implementations

Author: sipa

bip-0173.mediawiki

@@ -243,6 +243,8 @@ P2PKH addresses can be used.
 ** [https://github.com/sipa/bech32/tree/master/ref/c For C]
 ** [https://github.com/sipa/bech32/tree/master/ref/javascript For JavaScript]
 ** [https://github.com/sipa/bech32/tree/master/ref/python For Python]
+** [https://github.com/sipa/bech32/tree/master/ref/haskell For Haskell]
+** [https://github.com/sipa/bech32/tree/master/ref/rust For Rust]
 
 * Fancy decoder that localizes errors:
 ** [https://github.com/sipa/bech32/tree/master/ecc/javascript For JavaScript] ([http://bitcoin.sipa.be/bech32/demo/demo.html demo website])