Update README.md

Author: Hack666r

hackathons/README.md

@@ -37,7 +37,7 @@ Find more information about the sandbox and how to deploy a counter contract to
 
 #### Writing private programs with aztec.nr
 
-Noir is a ZKDSL for writing zk circuits and verifying them on-chain. [Aztec.nr](http://aztec.nr) is a smart contract framework -- written in Noir -- that has types and methods for rich smart contract semantics.
+Noir is a ZKDSL for writing zk circuits and verifying them on-chain. [Aztec.nr](https://github.com/AztecProtocol/aztec-nr) is a smart contract framework -- written in Noir -- that has types and methods for rich smart contract semantics.
 
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