docs(readme): update table of contents with FAQ addition

Author: remarkablemark

README.md

@@ -50,6 +50,7 @@ parse('<p>Hello, World!</p>'); // React.createElement('p', {}, 'Hello, World!')
   - [Warning: validateDOMNesting(...): Whitespace text nodes cannot appear as a child of table](#warning-validatedomnesting-whitespace-text-nodes-cannot-appear-as-a-child-of-table)
   - [Don't change case of tags](#dont-change-case-of-tags)
   - [TS Error: Property 'attribs' does not exist on type 'DOMNode'](#ts-error-property-attribs-does-not-exist-on-type-domnode)
+  - [Can I enable `trim` for certain elements?](#can-i-enable-trim-for-certain-elements)
 - [Performance](#performance)
 - [Contributors](#contributors)
   - [Code Contributors](#code-contributors)