Add link to implementation on Bitcoin Core (PR#10437)

bip-0135.mediawiki

@@ -388,9 +388,11 @@ By way of design it does not interfere with unknown (undefined) deployments.
 
 ==Reference implementation==
 
-A working reference implementation, including tests, can be found in this Pull Request:
+A working reference implementation, including tests, can be found in these Pull Requests:
 
-https://github.com/BitcoinUnlimited/BitcoinUnlimited/pull/458
+* https://github.com/BitcoinUnlimited/BitcoinUnlimited/pull/458
+
+* https://github.com/bitcoin/bitcoin/pull/10437
 
 Existing unit tests and regression tests have been left active to demonstrate
 backward compatibility of the default settings with BIP9.