export SignleCascaderProps and MultipleCascaderProps to index file

[babycannotsay]

#220 忘了在index文件中导出SignleCascaderProps和MultipleCascaderProps了。这边补上。ant-design的相关pr

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[codecov]

Codecov Report

Merging #244 (67bb045) into master (eea408a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #244   +/-   ##
=======================================
  Coverage   99.78%   99.78%           
=======================================
  Files          15       15           
  Lines         474      474           
  Branches      124      118    -6     
=======================================
  Hits          473      473           
  Misses          1        1           

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