Add react and react-dom as peer dependencies

[yoyo837]

#206

[codecov]

Codecov Report

Merging #232 (b96a5d3) into master (ae52de2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #232   +/-   ##
=======================================
  Coverage   89.01%   89.01%           
=======================================
  Files          11       11           
  Lines         519      519           
  Branches      131      131           
=======================================
  Hits          462      462           
  Misses         57       57           

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[yoyo837]

@afc163 @zombieJ 这里也来个patch。