Add react and react-dom as peer dependencies

[brandonbloom]

Fixes errors using Yarn 2 (berry).

See ant-design/ant-design#27339 for details.

[vercel]

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🔍 Inspect: https://vercel.com/react-component/input-number/b9fhvm097
✅ Preview: https://input-number-git-react-peer-dependencies.react-component.vercel.app

[codecov]

Codecov Report

Merging #272 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #272   +/-   ##
=======================================
  Coverage   93.01%   93.01%           
=======================================
  Files           1        1           
  Lines         372      372           
  Branches      134      134           
=======================================
  Hits          346      346           
  Misses         26       26           

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