Fix format of dependency pytest

[cmccandless]

Checklist

• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.

Short description of what this PR does:

• Fix syntax error in requirments file

[codecov]

Codecov Report

Merging #619 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #619   +/-   ##
=======================================
  Coverage   84.77%   84.77%           
=======================================
  Files          35       35           
  Lines        1156     1156           
  Branches      172      172           
=======================================
  Hits          980      980           
  Misses         90       90           
  Partials       86       86

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[agnesjang98]

LGTM

[thinkingserious]

Hello @cmccandless,

Thanks again for the PR!

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