Added pytest-cov to dev requirements

[AntObi]

Pull Request Template

Description

• Added pytest-cov to requirements-dev.txt

Fixes #142

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

N/A

Reviewers

N/A

Checklist:

• 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
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Merging #143 (819e822) into master (d2329ea) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #143   +/-   ##
=======================================
  Coverage   72.64%   72.64%           
=======================================
  Files          24       24           
  Lines        1872     1872           
=======================================
  Hits         1360     1360           
  Misses        512      512