Require pymysql>=1.0.0, which has a context managed connection

[nickeopti]

Closes #185, as pymysql version >=1.0 has a context managed connection. See https://github.com/PyMySQL/PyMySQL/blob/main/pymysql/connections.py#L354

[codecov]

Codecov Report

Merging #229 (b3e659a) into main (c1c5b56) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #229   +/-   ##
=======================================
  Coverage   98.46%   98.46%           
=======================================
  Files          45       45           
  Lines        2221     2221           
  Branches      278      278           
=======================================
  Hits         2187     2187           
  Misses         19       19           
  Partials       15       15           

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[j08lue]

Thanks!