I found that the latest update https://github.com/prprprus/PyMySQLPool/commit/212110afaaa01f1d0d3faa8fe099ad19f48a8fbe has not been updated to pypi.
I believe this update can also solve https://github.com/prprprus/PyMySQLPool/issues/14.
If available, please update pypi.
Not finished.
In the Github version code, it has `daemon=True` at [Line 134](https://github.com/prprprus/PyMySQLPool/blob/master/pymysqlpool/pool.py#L134).
But it is not updated to PyPi.