Update README.md

Author: layumi

README.md

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 [![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/layumi/Person_reID_baseline_pytorch.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/layumi/Person_reID_baseline_pytorch/context:python)
 [![Total alerts](https://img.shields.io/lgtm/alerts/g/layumi/Person_reID_baseline_pytorch.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/layumi/Person_reID_baseline_pytorch/alerts/)
-[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![License: MIT](https://img.shields.io/badge/License-MIT-orange.svg)](https://opensource.org/licenses/MIT)
 
 Baseline Code (with bottleneck) for Person-reID (pytorch).
 It is consistent with the new baseline result in [Beyond Part Models: Person Retrieval with Refined Part Pooling](https://arxiv.org/abs/1711.09349) and [Camera Style Adaptation for Person Re-identification](https://arxiv.org/abs/1711.10295).