BIP 8: Drop unmaintained reference implementation

Author: luke-jr

bip-0008.mediawiki

@@ -224,10 +224,6 @@ If a client does not understand a rule without the prefix, it may use it unmodif
 On the other hand, when this prefix is used, it indicates a more subtle change to the block structure or generation transaction; examples of this would be BIP 34 (because it modifies coinbase construction) and 141 (since it modifies the txid hashing and adds a commitment to the generation transaction).
 A client that does not understand a rule prefixed by '!' must not attempt to process the template, and must not attempt to use it for mining even unmodified.
 
-=== Reference implementation ===
-
-https://github.com/bitcoin/bitcoin/compare/master...shaolinfry:bip8-height
-
 ==Contrasted with BIP 9==
 
 * The '''lockinontimeout''' flag is added. BIP 9 would only transition to the FAILED state when timeout was reached.