Use ReactNode for children of Cascader to allow null, strings and more

[FredrikAugust]

This is the default behaviour for components in React, and will allow null as a child (which is the result when typing <Component />).

[vercel[bot]]

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[codecov[bot]]

Codecov Report

Merging #208 (8d014fa) into master (00c05ab) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 8d014fa differs from pull request most recent head db2b348. Consider uploading reports for the commit db2b348 to get more accurate results

@@           Coverage Diff           @@
##           master     #208   +/-   ##
=======================================
  Coverage   99.71%   99.71%           
=======================================
  Files           9        9           
  Lines         355      355           
  Branches       95       95           
=======================================
  Hits          354      354           
  Misses          1        1           

Impacted Files	Coverage Δ
src/Cascader.tsx	100.00% <ø> (ø)

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[afc163]

rc-tree-select 里要先改下。

[FredrikAugust]

English? 🇬🇧

[afc163]

CI failed