Bump es6-promise from 4.2.2 to 4.2.4

Bumps [es6-promise](https://github.com/stefanpenner/es6-promise) from 4.2.2 to 4.2.4.
- [Changelog](https://github.com/stefanpenner/es6-promise/blob/master/CHANGELOG.md)
- [Commits](https://github.com/stefanpenner/es6-promise/compare/v4.2.2...v4.2.4)

package-lock.json

@@ -1439,9 +1439,9 @@
       }
     },
     "es6-promise": {
-      "version": "4.2.2",
-      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.2.tgz",
-      "integrity": "sha512-LSas5vsuA6Q4nEdf9wokY5/AJYXry98i0IzXsv49rYsgDGDNDPbqAYR1Pe23iFxygfbGZNR/5VrHXBCh2BhvUQ=="
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.4.tgz",
+      "integrity": "sha512-/NdNZVJg+uZgtm9eS3O6lrOLYmQag2DjdEXuPaHlZ6RuVqgqaVZfgYCepEIKsLqwdQArOPtC3XzRLqGGfT8KQQ=="
     },
     "es6-set": {
       "version": "0.1.5",

package.json

@@ -7,7 +7,7 @@
     "test": "tests"
   },
   "dependencies": {
-    "es6-promise": "^4.2.2",
+    "es6-promise": "^4.2.4",
     "handlebars": "^4.0.11",
     "karma-sourcemap-loader": "^0.3.7",
     "u2f-api": "^0.2.7"