Handling wrong data in input when Enter is press

[dbertella]

Related to #945 I think the correct behaviour should be exactly as if you click outside when the data is wrong.
The input field keep the wrong data as it is and the implementer should handle the error if needed.

Let me know if you find this interesting and if there is anything else to do I can keep working on it.

[codecov-io]

Codecov Report

Merging #946 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #946      +/-   ##
=========================================
+ Coverage   85.85%   85.9%   +0.04%     
=========================================
  Files          12      12              
  Lines         608     610       +2     
  Branches      119     120       +1     
=========================================
+ Hits          522     524       +2     
  Misses          3       3              
  Partials       83      83

Impacted Files	Coverage Δ
src/datepicker.jsx	91.77% <100%> (+0.1%)	⬆️

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