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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