fix(package): update date-fns to version 2.0.1

Closes #63

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "boolean": "^1.0.0",
     "csv-parser": "^2.0.0",
     "csv-stringify": "^4.0.1",
-    "date-fns": "^1.29.0",
+    "date-fns": "^2.0.1",
     "ejs": "^2.6.1",
     "email-templates": "^5.0.1",
     "email-validator": "^2.0.4",