Address Installation Dependency Gaps

[d33bs]

Description

When installing Pycytominer using pip from Github hashes there is a dependency gap with pyarrow due to mismatches between requirements.txt and setup.py. This currently causes new functionality to be otherwise unavailable until the dependency is resolved manually.

Changes in this PR update setup.py to reference requirements.txt when installing Pycytominer. I've also added capitalization for globals to help make these more visible from a style perspective.

Many thanks go to @axiomcura for help in highlighting this issue!

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

Please ensure that all boxes are checked before indicating that a pull request is ready for review.

• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have deleted all non-relevant text in this pull request template.

[gwaybio]

One comment and one requested change (run black please)

[codecov-commenter]

Codecov Report

Merging #232 (07157ea) into master (f3206da) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #232   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files          53       53           
  Lines        2772     2772           
=======================================
  Hits         2653     2653           
  Misses        119      119           

Flag	Coverage Δ
unittests	95.70% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
setup.py	0.00% <0.00%> (ø)

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[gwaybio]

I will merge once @falquaddoomi gives his 👍 - thanks @d33bs !