Update README.md

README.md

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 # easyCV
-      Video recorder and snapshot(video image capture) library,based on javaCV. 
+      Video recorder and snapshot(video image capture) library,based on javaCPP & javaCV & FFmpeg. 
       基于javaCV的跨平台视频录像和快照(视频截图)库，开箱即用。
 ### 更新
 	2019年7月22日