Update enzyme from 3.3.0 to 3.7.0

Author: dependencies-bot

package.json

@@ -55,7 +55,7 @@
     "codecov": "^3.0.0",
     "cross-env": "^5.1.3",
     "css-loader": "^0.28.9",
-    "enzyme": "^3.3.0",
+    "enzyme": "^3.7.0",
     "enzyme-adapter-react-16": "^1.1.1",
     "eslint": "^4.17.0",
     "eslint-config-airbnb": "^16.1.0",