update README.md

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long2ice 2020-09-28 12:50:43 +08:00
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And if `aerich` guess you are renaming a column, it will ask `Rename {old_column} to {new_column} [True]`, you can choice `True` to rename column without column drop, or choice `False` to drop column then create.
If you use `MySQL`, only MySQL8.0+ support `rename..to` syntax.
### Upgrade to latest version
```shell