add labelField and valueField for custom label field name and value field name

[405go]

Add labelField and valueField for custom label field name and value field name, It is not should just use value and label

[afc163]

I think your PR is useful for ant-design/ant-design#9929

Could you finish it and add some test cases? @405go

[codecov-io]

Codecov Report

Merging #23 into master will increase coverage by 0.19%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #23      +/-   ##
=========================================
+ Coverage    92.2%   92.4%   +0.19%     
=========================================
  Files           3       3              
  Lines         154     158       +4     
  Branches       50      54       +4     
=========================================
+ Hits          142     146       +4     
  Misses         12      12

Impacted Files	Coverage Δ
src/Cascader.jsx	91.72% <100%> (+0.25%)	⬆️
src/Menus.jsx	95.45% <100%> (ø)	⬆️

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[405go]

@afc163 ok, i have finished

[afc163]

How about filedNames={{ name: 'name', label: 'code', children: 'nodes' }} instead of three different props.

[405go]

@afc163 It is a good ideal

[405go]

@afc163 now it is good

[afc163]

Thx for you job!

BTW, your commit is not recognized by GitHub.

[405go]

@afc163 It is our project style,It has become a habit.

[afc163]

I mean this

[vizonluo]

misspell, it should be fieldNames