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**Features and Improvements**
- fully migrate to ``sqlalchemy`` 1.4+ 2.0 styled API, dropped < 1.3 API support
- maintain a big version number compatability with Sqlalchemy, won't be responsible to be compatible with different major version. For example, ``sqlalchemy_mate==1.4.x`` maintain compatibility to ``sqlalchemy>=1.4.0,<1.5.0``.