add remove_dropped_col, ugly version #46
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当前环境py3.6.8,mysql5.7,执行生成回滚SQL时异常:UnicodeDecodeError: 'utf-8' codec can'
t decode byte 0xd5 in position 49: invalid continuation byte,原因为decode()方法的第二个参数默认为严格strick,需修改为ignore