Update README

Author: bcomnes

README.md

@@ -301,7 +301,7 @@ Render the component. Returns a proxy node if already mounted on the DOM. Proxy
 nodes make it so DOM diffing algorithms leave the element alone when diffing.  Call this when `arguments` have changed.  
 
 ### `component.rerender()`
-Re-run `.render` using the last `arguments` that were passed to the `.render` call.  Useful for triggering internal component renders if internal state has changed, but arguments have not. Bypasses the `.update` function. Don't call this when the component is not mounted in the page (e.g. `if (!this.element)`).
+Re-run `.render` using the last `arguments` that were passed to the `render` call.  Useful for triggering component renders if internal state has change.  Arguments are automatically cached under `this._arguments` (🖐 hands off, buster! 🖐).  The `update` method is bypassed on re-render.
 
 ### `component.element`
 A [getter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get)