Add Config::withIO()

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.81%. Comparing base (987d571) to head (2d2015b).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Config.php	0.00%	18 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #18      +/-   ##
=============================================
- Coverage      91.47%   89.81%   -1.66%     
- Complexity       126      127       +1     
=============================================
  Files             21       21              
  Lines            974      992      +18     
=============================================
  Hits             891      891              
- Misses            83      101      +18     

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