fix(package): update auth0-lock to version 11.8.1

Closes #307

Author: greenkeeper[bot]

package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "async": "2.6.0",
     "atob": "^2.0.3",
-    "auth0-lock": "11.6.1",
+    "auth0-lock": "11.8.1",
     "babel-polyfill": "^6.26.0",
     "blob": "0.0.4",
     "body-parser": "^1.15.2",