fix(package): update jest-enzyme to version 6.1.1

Closes #162

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
     "firebase": "^4.8.0",
     "history": "^4.7.2",
     "husky": "^0.14.3",
-    "jest-enzyme": "^5.0.0",
+    "jest-enzyme": "^6.1.1",
     "lint-staged": "^6.0.0",
     "lodash": "^4.17.4",
     "material-ui": "^0.20.0",