message: fix: use stacks.js repo url
diff: @@ -57,8 +57,8 @@ export class BlockstackError extends Error {
  } else {
  bugDetails += `Stack Trace:\n${stack}`;
  }
  - message += `\nIf you believe this exception is caused by a bug in blockstack.js,
  - please file a bug report: https://github.com/blockstack/blockstack.js/issues\n\n${bugDetails}`;
  + message += `\nIf you believe this exception is caused by a bug in stacks.js,
  + please file a bug report: https://github.com/blockstack/stacks.js/issues\n\n${bugDetails}`;
  this.message = message;
  this.code = error.code;
  this.parameter = error.parameter ? error.parameter : undefined;
  