38: Remove dead reference implementation link

Author: achow101

bip-0038.mediawiki

@@ -209,8 +209,7 @@ The preliminary values of 16384, 8, and 8 are hoped to offer the following prope
 ==Reference implementation==
 Added to alpha version of Casascius Bitcoin Address Utility for Windows available at:
 
-* via https: https://casascius.com/btcaddress-alpha.zip
-* at github: https://github.com/casascius/Bitcoin-Address-Utility
+* https://github.com/casascius/Bitcoin-Address-Utility
 
 Click "Tools" then "PPEC Keygen" (provisional name)