Issue when using backspace and then typing again past non-masked chars

[jwenzler]

You can replicate this issue easily by going to your demo at https://cdn.rawgit.com/probil/v-mask/vue-2.0/demo/index.html.

In the first input type the following keystrokes: 1, 2, 3.

Now backspace twice to where only '12' is left.

If you type 3 again, the keystroke is lost (transformed into a /).

[probil]

Thanks, @jwenzler. I got it. I will fix it

[jwenzler]

Thanks! Have a good one.

[RonaldJerez]

I have made some changes to fix this as well as issue #7, i was going to create a PR but since I didn't create a separate branch for it, it is pulling in the changes I made for PR #23 as well, once you get a chance to review that pull request I can create another for this change.

[probil]

Merged commits from @RonaldJerez
And it seems like it fixed the issue. Please, check it out in v1.0.4