add libwally as bip39 implementation

Lawrence Nahum · Lawrence Nahum · commit a4128372005d · 2017-08-11T22:31:00.000+02:00
diff --git a/bip-0039.mediawiki b/bip-0039.mediawiki
@@ -158,3 +158,6 @@ Swift:
 
 C++:
 * https://github.com/libbitcoin/libbitcoin/blob/master/include/bitcoin/bitcoin/wallet/mnemonic.hpp
+
+C (with Python/Java/Javascript bindings):
+* https://github.com/ElementsProject/libwally-core
