run slotscheck explicitly on files

[ariebovenberg]

I have made things!

slotscheck will become more strict about import paths in the future. I'm changing the invocation here to ensure slotscheck runs on the files, not the installed package. Running with python -m ensures the current working directory is in sys.path so the correct files are imported.

Checklist

• I have double checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc)
• I have created at least one test case for the changes I have made n/a
• I have updated the documentation for the changes I have made n/a
• I have added my changes to the CHANGELOG.md n/a

Related issues

#1233

[codecov]

Codecov Report

Merging #1265 (4e654fe) into master (1630e06) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #1265   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           79        79           
  Lines         2434      2434           
  Branches       211       211           
=========================================
  Hits          2434      2434           

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[sobolevn]

Great progress with slotscheck! Thanks!