Merge pull request #72 from github/tom-corbett-patch-1

Update README.md

Author: koddsson

README.md

@@ -1,5 +1,5 @@
 # Catalyst
 
-Catalyst is a set of patterns and techniques for developing components within a complex application. At it's core, Catalyst simply provides a small library of functions to make developing Web Components easier.
+Catalyst is a set of patterns and techniques for developing components within a complex application. At its core, Catalyst simply provides a small library of functions to make developing Web Components easier.
 
 For more see the [Catalyst Website](https://github.github.io/catalyst/) which includes a [Guide To using Catalyst](https://github.github.io/catalyst/guide/introduction).