Request Invoice cancelation or change notification

Hello Invoice Ninja, I would like to sugest one feature which is in my mind very important. In my use of Invoice Ninja several times I have changed invoice itself and in few cases I have send it to the wrong client, I mean it happens :)

But after that I had to notify clients personally or via other means. My sugestion is to add one template for email notifications and some function call it for example Invoice change notification or cancelation. So that all that can be done from inside the system.

I think this would be useful.

Thank you!