[Docs] correct read; we sham Function#name, not toString.

README.md

@@ -77,7 +77,7 @@ In both browser and node you may also want to include `unorm`; see the [`String.
     * `keys()` (in ES5, but no longer throws on non-object non-null/undefined values in ES6)
     * `setPrototypeOf()` (IE >= 11)
 * `Function.prototype`:
-    * `toString()` (es6-sham, covers IE 9-11)
+    * `name` (es6-sham, covers IE 9-11)
 * `Math`:
     * `acosh()`
     * `asinh()`