Update dependency enzyme to v3.9.0

Author: renovate-bot

package-lock.json

@@ -40,7 +40,7 @@
     "@types/pdfobject": "2.0.6",
     "codecov": "3.2.0",
     "custom-tslint-formatters": "2.4.0",
-    "enzyme": "3.8.0",
+    "enzyme": "3.9.0",
     "enzyme-adapter-react-16": "1.9.1",
     "enzyme-to-json": "3.3.5",
     "husky": "1.3.1",