Update setup.py to add env variable for min version

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Unit Test Results (build & test)

63 tests  ±0   63 :heavy_check_mark: ±0   3s :stopwatch: -2s   1 suites ±0     0 :zzz: ±0    1 files   ±0     0 :x: ±0 

Results for commit a5d34c55. ± Comparison against base commit 69ffaf59.

:recycle: This comment has been updated with latest results.