Update README.md

Author: TangXiaoLv

README.md

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 EffectiveShapeView
 ====
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 A fast，flexible，powerful ImageView that supports rounded corners，circles，polygon.Used by shader which is fastest model of draw. This is based on [RoundedImageView from Vince Mi](https://github.com/vinc3m1/RoundedImageView)， but more lightweight(under 400 line code).