docs: fixed URL to Pedersen hash documentation (#15)

src/js/signature.ts

@@ -78,7 +78,7 @@ function hasHexPrefix(str: string) {
 
 /**
  Full specification of the hash function can be found here:
- https://starkware.co/starkex/docs/signatures.html#pedersen-hash-function
+ https://docs.starkware.co/starkex/crypto/pedersen-hash-function.html
  shiftPoint was added for technical reasons to make sure the zero point on the elliptic curve does
  not appear during the computation. constantPoints are multiples by powers of 2 of the constant
  points defined in the documentation.