feat: add another class in monthTable to distinguish same month & same date

[eternalsky]

fix issue #434

[ant-design-bot]

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[codecov-io]

Codecov Report

Merging #435 into master will decrease coverage by 0.06%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
- Coverage   88.31%   88.25%   -0.07%     
==========================================
  Files          10       10              
  Lines         702      698       -4     
  Branches      192      192              
==========================================
- Hits          620      616       -4     
  Misses         69       69              
  Partials       13       13

Impacted Files	Coverage Δ
src/month/MonthTable.js	88.33% <100%> (-0.73%)	:arrow_down:

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[eternalsky]

@afc163 @zombieJ please review if it can be merged

[eternalsky]

@zombieJ could you please review this pr?

[afc163]

有冲突