fix: 日期选择器的时间应该一整天时间(例如2021/1/28)

[duuliy]

请允许此次提交，日期应该是一整天的，否则前后时间选择同一天，返回值取时间戳不是一整天，不符合日期选择器

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[codecov[bot]]

Codecov Report

Merging #209 (b9ce756) into master (6fca0f6) will increase coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head b9ce756 differs from pull request most recent head ced4dac. Consider uploading reports for the commit ced4dac to get more accurate results

@@           Coverage Diff           @@
##           master     #209   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          45       45           
  Lines        2113     2127   +14     
  Branches      621      625    +4     
=======================================
+ Hits         2103     2117   +14     
  Misses          8        8           
  Partials        2        2           

Impacted Files	Coverage Δ
src/RangePicker.tsx	100.00% <100.00%> (ø)
src/generate/dateFns.ts	100.00% <100.00%> (ø)
src/generate/dayjs.ts	100.00% <100.00%> (ø)
src/generate/moment.ts	100.00% <100.00%> (ø)

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