Add current date to readme usage example

Just to avoid confusion between GMT and default dates
8 years ago · 14bd9a3152
1 changed files with 3 additions and 0 deletions
--- a/README.md
+++ b/README.md
@ -29,6 +29,9 @@ const headers = {
  'via': '1.1 varnish-v4'
 };

+new Date()
+// Date('2016-12-23T05:54:31.000Z')
+
 expired(headers)
 // false