Update README.md

Author: jwyang

README.md

@@ -2,7 +2,7 @@
 
 ## Write at the beginning
 
-This repo was initaited about two years ago, developed as the first open-sourced object detection code which supports multi-gpu training. It has been integrating tremendous efforts from many people. However, we have seen many high-quality repos emerged in the last years, such as:
+[05/29/2020] This repo was initaited about two years ago, developed as the first open-sourced object detection code which supports multi-gpu training. It has been integrating tremendous efforts from many people. However, we have seen many high-quality repos emerged in the last years, such as:
 
 * [maskrcnn-benchmark](https://github.com/facebookresearch/maskrcnn-benchmark)
 * [detectron2](https://github.com/facebookresearch/detectron2)