Cursor index when adding multiple characters in format

[NouraldinS]

This library is awesome and all, done pretty much most of the heavy lifting I wasted work hours on. But it has a small problem

Problem statement

When reformatting the value, if I add characters to the new value as in:

...
format={v => v + 'abcd'};
...

The cursor would stand where I would normally be without the newly added characters, not at the end of the new string.

Problem reproduced

https://codesandbox.io/s/istarkovrifm-cursor-index-bug-p9mjr

Versions

node: v11.14.0
npm: 6.9.2
rifm: ^0.9.1

[antiold]

I believe the new append prop solves this :-)