chore(deps): update dependency enzyme-adapter-react-16 to v1.15.6

Author: renovate-bot

package.json

@@ -181,7 +181,7 @@
     "css-loader": "0.28.9",
     "dotenv": "5.0.0",
     "enzyme": "3.3.0",
-    "enzyme-adapter-react-16": "1.1.1",
+    "enzyme-adapter-react-16": "1.15.6",
     "eslint": "4.12.1",
     "eslint-config-airbnb": "16.1.0",
     "eslint-config-prettier": "2.9.0",