message: changed error message caused by safe wallets to a more user friendly message
  Reviewers: benchan, omaid
  Subscribers: ben
diff: @@ -205,7 +205,7 @@ Wallet.prototype.createAddress = function(params, callback) {
  params = params || {};
  common.validateParams(params, [], [], callback);
  if (this.type() === 'safe') {
  - throw new Error('cannot create an address for safe wallet; use .id()');
  + throw new Error('You are using a legacy wallet that cannot create a new address');
  }
  // Default to client-side address validation on, for safety. Use validate=false to disable.
  