Update README.md

Author: jwyang

README.md

@@ -85,7 +85,7 @@ Thanks to [Remi](https://github.com/Cadene) for providing the pretrained detecti
 ### What we are going to do
 
 - [x] Support both python2 and python3 (great thanks to [cclauss](https://github.com/cclauss)).
-- [ ] Add deformable pooling layer as alternative for roi pooling (mainly supported by [Xander](https://github.com/xanderchf))
+- [ ] Add deformable pooling layer as an alternative way for roi pooling (mainly supported by [Xander](https://github.com/xanderchf))
 - [ ] ~~Run systematical experiments on PASCAL VOC 07/12, COCO, ImageNet, Visual Genome (VG) with different settings.~~
 - [ ] ~~Write a detailed report about the new stuffs in our implementations, and the quantitative results in our experiments.~~