Update README.md

Author: PkuRainBow

README.md

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 ## News
 
+- 2022/03/09 [MLSeg](https://github.com/openseg-group/MLSeg) is a more effective formulation of general segmentation problem and improves various SOTA segmentation methods across multiple benchmarks.
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 - 2021/09/14 [MMSegmentation](https://github.com/open-mmlab/mmsegmentation) has supported our ISANet and refer to [ISANet](https://github.com/open-mmlab/mmsegmentation/tree/master/configs/isanet) for more details.