Merge pull request #17 from btrd/patch-1

Fix link to NaturalSort gem

Readme.md

@@ -29,7 +29,7 @@ array.sort! { |a,b| collator.compare(a, b) }
 TODO
 ====
  - Sort non-ascii-convertables like ß(ss), œ(oe) , fi(fi), see [Ligatures](http://en.wikipedia.org/wiki/Typographical_ligature)
- - Integrate natural sorting e.g. `['a11', 'a2'] => ['a2', 'a11']` like [NaturalSort](http://rubyforge.org/projects/naturalsort)
+ - Integrate natural sorting e.g. `['a11', 'a2'] => ['a2', 'a11']` like [NaturalSort](https://github.com/johnnyshields/naturalsort)
 
 ### [Contributors](https://github.com/grosser/sort_alphabetical/contributors)
 =======