Update update-subtree.sh

Author: surinder83singh

depend/update-subtree.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 # This command pulls the latest updates from the master branch of the subtree and commits them in depend/secp256k1.
 # See man git-subtree(1) for more details.
-git subtree pull --prefix depend/secp256k1 https://github.com/kaspanet/secp256k1.git master --squash
+git subtree pull --prefix depend/secp256k1 https://github.com/bitcoin-core/secp256k1.git master --squash