Set max supported sqlalchemy version

[Pliner]

What do these changes do?

This change prevents installation of unsupported version of SQLAlchemy

Related issue number

#798

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[codecov]

Codecov Report

Merging #805 (16712d1) into master (07f3934) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #805   +/-   ##
=======================================
  Coverage   93.45%   93.45%           
=======================================
  Files          13       13           
  Lines        1542     1542           
  Branches      178      178           
=======================================
  Hits         1441     1441           
  Misses         72       72           
  Partials       29       29           

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