SQLAlchemy version requirement to low

[mosheduminer]

In helpers.py, DeclarativeMeta is imported as follows:

from sqlalchemy.orm import DeclarativeMeta

This import is correct only in sqlalchemy>=1.4, not in 1.3. However, the requirements for this project allow for 1.3 as well.

Given I am migrating an existing project that is currently using sqlalchemy 1.3, I request that the import be changed to:

try:
    from sqlalchemy.orm import DeclarativeMeta
except ImportError:
    from sqlalchemy.ext.declarative.api import DeclarativeMeta

But if not, please bump the sqlalchemy version in setup.py.

[mrevutskyi]

Thank you for reporting. Fixed the import. v2.0.2 has been published