Update Babel & Storybook, fix k in knobs

[azizhk]

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[codecov]

Codecov Report

Merging #139 into master will decrease coverage by 7.28%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
- Coverage   75.26%   67.97%   -7.29%     
==========================================
  Files          71       68       -3     
  Lines         857      584     -273     
  Branches      172      171       -1     
==========================================
- Hits          645      397     -248     
+ Misses        194      171      -23     
+ Partials       18       16       -2

Impacted Files	Coverage Δ
src/components/OptionGroupRadio.tsx	100% <100%> (ø)	⬆️
src/components/PopUp.tsx	12.5% <0%> (-33.66%)	⬇️
src/components/Sidebar.tsx	6.25% <0%> (-27.09%)	⬇️
src/components/Modal.tsx	0% <0%> (-22.23%)	⬇️
src/components/Slider.tsx	5.88% <0%> (-16.85%)	⬇️
src/components/Popper.tsx	66.66% <0%> (-16.67%)	⬇️
src/components/TypeAhead.tsx	64.7% <0%> (-15.94%)	⬇️
src/components/DropDown.tsx	71.42% <0%> (-15.24%)	⬇️
src/components/OptionGroupCheckBox.tsx	77.77% <0%> (-14.53%)	⬇️
src/components/Stepper.tsx	0% <0%> (-11.37%)	⬇️
... and 49 more

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