Fix ButtonGroup component storybook docs rendering error

[alstn2468]

Description

Fixed a rendering error in the storybook document of the ButtonGroup component.

Solution: install babel-plugin-react-require
The package has not been maintained for a long time, so I'm not sure if it's the right way to actually use it.
However, this package became the solution to issue #60.

Related Issues

[ButtonGroup] docs not rendering. (#60)

Checklist

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[codecov]

Codecov Report

Merging #64 (79a2a39) into master (f41047a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   94.22%   94.22%           
=======================================
  Files          21       21           
  Lines         554      554           
  Branches      235      235           
=======================================
  Hits          522      522           
  Misses         32       32           

[hyochan]

Thank you for the fixes!!

It looks like a problem with an old storybook version that uses react version under 17. We can remove this when upgraded.