README.md in ziptz-1.0.30 vs README.md in ziptz-1.0.31

- old
+ new

@@ -4,10 +4,10 @@
 [![Dependency Status](http://img.shields.io/gemnasium/infused/ziptz.svg?style=flat)](https://gemnasium.com/infused/ziptz)
 [![Total Downloads](https://img.shields.io/gem/dt/ziptz.svg)](https://rubygems.org/gems/ziptz/)
 
 Get the time zone for any US ZIP code.
 
-<i>ZIP codes are up to date as of <b>December 2017</b>.</i>
+<i>ZIP codes are up to date as of <b>January 2018</b>.</i>
 
 ## Installation
 
 Add the gem to your Gemfile:
 