Can now bind any listener provided by user to the input

[pareeohnos]

This PR allows developers to bind any listener they like to the input element, rather than just specific ones. This is really useful for things like preventing the enter key submitting the form for instance, and I'm sure many other use cases.

[codecov[bot]]

Codecov Report

Merging #76 into master will increase coverage by 0.08%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   97.95%   98.03%   +0.08%     
==========================================
  Files           1        1              
  Lines          49       51       +2     
  Branches       20       20              
==========================================
+ Hits           48       50       +2     
  Partials        1        1

Impacted Files	Coverage Δ
src/vue-numeric.vue	98.03% <100%> (+0.08%)	:arrow_up:

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[kevinongko]

Can you add readme for this usage?