update hdkey to 1.1.1

Author: Vitaly Migunov

package.json

@@ -35,7 +35,7 @@
     "aes-js": "^3.1.1",
     "bs58check": "^2.1.2",
     "ethereumjs-util": "^6.0.0",
-    "hdkey": "^1.1.0",
+    "hdkey": "^1.1.1",
     "randombytes": "^2.0.6",
     "safe-buffer": "^5.1.2",
     "scrypt.js": "^0.3.0",