谢昕辰 3312c505af
[Doc] Update readme (#2834)
## Motivation

As title, lead users to follow our migration document.

## Checklist

- [x] https://github.com/open-mmlab/mmsegmentation/pull/2801
2023-04-06 14:57:25 +08:00
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2023-04-06 14:57:25 +08:00