README.md in PageRankr-4.4.1 vs README.md in PageRankr-4.6.0

@@ -8,9 +8,11 @@
 
 __Note: Version >= 4.1.0 no longer actively maintains compatibility with Ruby 1.8.X. It will probably still work for the time being.__
 
 __Note: Version >= 4.2.0 no longer actively maintains compatibility with Ruby < 1.9.3. It will probably still work, but you may need to specify older versions for gems this library depends on in your Gemfile.__
 
+__Note: Version >= 4.5.0 no longer actively maintains compatibility with Ruby < 2.0.__
+
 Check out a little [web app][1] I wrote up that uses it or look at the [source][2].
 
 [1]: http://isitpopular.heroku.com
 [2]: https://github.com/blatyo/is_it_popular