Merge pull request bitcoin#424 from elias19r/patch-1

Minor link fix

Author: luke-jr

bip-0021.mediawiki

@@ -124,4 +124,4 @@ Characters must be URI encoded properly.
 
 === Libraries ===
 * Javascript - https://github.com/bitcoinjs/bip21
-* [[BitcoinPaymentURI|https://github.com/SandroMachado/BitcoinPaymentURI]] Java library to process and generate Bitcoin payment URI's.
+* https://github.com/SandroMachado/BitcoinPaymentURI Java library to process and generate Bitcoin payment URI's.