Update dependency enzyme to v3

Author: renovate[bot]

package.json

@@ -30,7 +30,7 @@
     "babel-polyfill": "6.26.0",
     "babel-preset-react-app": "0.2.1",
     "chai": "3.5.0",
-    "enzyme": "2.9.1",
+    "enzyme": "3.11.0",
     "escope": "3.6.0",
     "eslint": "4.18.2",
     "eslint-config-airbnb": "16.1.0",