Avoid using shell=True

[ankona]

Remove explicit use of shell=True to avoid potential security issues

[codecov]

Codecov Report

Merging #327 (0e65668) into develop (211268e) will not change coverage.
The diff coverage is n/a.

❗ Current head 0e65668 differs from pull request most recent head c228040. Consider uploading reports for the commit c228040 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #327   +/-   ##
========================================
  Coverage    87.19%   87.19%           
========================================
  Files           59       59           
  Lines         3522     3522           
========================================
  Hits          3071     3071           
  Misses         451      451           

[ashao]

Looking at this in context, I don't see a good reason why this should have a shell=True.