Revert "update readme for paddle version (#3524)" (#3542)

This reverts commit 04bfe0a84e7ec27e5c0bdfab76aa779c45fedbe5.

README.md

@@ -7,7 +7,6 @@ detection models in both industry and research settings. We design
 PaddleDetection to be not only performant, production-ready but also highly
 flexible, catering to research needs.
 
-**Now all models in PaddleDetection require PaddlePaddle version 1.6 or higher, or suitable develop version.**
 
 <div align="center">
   <img src="demo/output/000000570688.jpg" />

README_cn.md

@@ -4,8 +4,6 @@
 
 PaddleDetection的目的是为工业界和学术界提供大量易使用的目标检测模型。PaddleDetection不仅性能完善，易于部署，同时能够灵活的满足算法研发需求。
 
-**目前检测库下模型均要求使用PaddlePaddle 1.6及以上版本或适当的develop版本。**
-
 <div align="center">
   <img src="demo/output/000000570688.jpg" />
 </div>