export SignleCascaderProps and MultipleCascaderProps

[babycannotsay]

export SignleCascaderProps and MultipleCascaderProps for use by antd cascader component ts enhancement
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[codecov]

Codecov Report

Merging #220 (aa813c3) into master (7deff02) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #220 +/- ##
=======================================
Coverage 99.72% 99.72% =======================================
Files 9 9 Lines 360 360 Branches 92 92 =======================================
Hits 359 359 Misses 1 1 

Impacted Files	Coverage Δ
src/Cascader.tsx	100.00% <ø> (ø)

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