Please add small fix

Good day! If you is not difficult, please add in the following versions of Contact Form 7
when submitting the form to submit input attribute disabled.
So it will be possible to stylize it during shipment and removes the possibility of a double click of a button.
Example ( contact form in the bottom ):

http://stewart.devbox25.com/
U: devbox25
P: crisp

P.S: Sorry for my bad english.

https://ww.wp.xz.cn/plugins/contact-form-7/