Add option for separate text output #347

[Spacetown]

Add option requested in #347.

[codecov]

Codecov Report

Merging #387 into master will decrease coverage by 0.03%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #387      +/-   ##
==========================================
- Coverage   94.95%   94.91%   -0.04%     
==========================================
  Files          19       19              
  Lines        2160     2164       +4     
  Branches      374      376       +2     
==========================================
+ Hits         2051     2054       +3     
  Misses         50       50              
- Partials       59       60       +1     

Impacted Files	Coverage Δ
gcovr/configuration.py	96.88% <ø> (ø)
gcovr/__main__.py	90.04% <50.00%> (-0.39%)	⬇️
gcovr/tests/test_args.py	100.00% <100.00%> (ø)

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[latk]

Looks good! Thanks for implementing this small but important change.

At some point it would also be a good idea to revisit the docs (readme, guide.rst, changelog) to ensure they are up to date with these recent features.