Update README for Liberator

Signed-off-by: Steven Downer <grinch@outlook.com>
Add getHandlerList() method to event

Merging pull request into "Add Custom Events" patch. Thanks @andrew2060!

Pull Request: https://github.com/Libigot/Libkit/pull/5

Signed-off-by: Steven Downer <grinch@outlook.com>