Update README.md

Co-authored-by: Jordan Harband <[email protected]>

Author: bstashchuk

README.md

@@ -46,7 +46,7 @@ Other Style Guides
   1. [Accessors](#accessors)
   1. [Events](#events)
   1. [jQuery](#jquery)
-  1. [ECMAScript 5 Compatibility](#es5-compat--kangax)
+  1. [ECMAScript 5 Compatibility](#ecmascript-5-compatibility)
   1. [ECMAScript 6+ (ES 2015+) Styles](#ecmascript-6-es-2015-styles)
   1. [Standard Library](#standard-library)
   1. [Testing](#testing)