Option for enabling escape key with blocking

[johnlimpin]

May we request a feature that we can enable the blocking feature but keep the escape button working? Our client only wants blocking the user when clicking outside the modal, but still want the escape button working. So that we can remove extra codes e.g. addEventListeners per every component that uses sweet modal.

Thanks!

[johnlimpin]

Here's the forked version to show what I am after. If you find it useful please let me know so I can submit pull request.

https://github.com/johnlimpin/sweet-modal-vue/commits/master