Allow hyphen in config names

[forman]

Closes #60

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.46%. Comparing base (79f497e) to head (84ee85d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
- Coverage   99.46%   99.46%   -0.01%     
==========================================
  Files          67       67              
  Lines        2806     2805       -1     
  Branches      412      412              
==========================================
- Hits         2791     2790       -1     
  Partials       15       15              

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