Fix branch names in CONTRIBUTING.md (master was renamed to main)

[Sturmflut]

No description provided.

[piponazo]

Thanks a lot for fixing these notes (and for all your new contributions 👍 )

[codecov]

Codecov Report

Merging #2070 (68ccc2c) into main (ed09d9f) will decrease coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2070      +/-   ##
==========================================
- Coverage   62.04%   61.83%   -0.22%     
==========================================
  Files          96       96              
  Lines       19194    19100      -94     
  Branches     9833     9817      -16     
==========================================
- Hits        11909    11810      -99     
- Misses       4978     4995      +17     
+ Partials     2307     2295      -12     

Impacted Files	Coverage Δ
src/safe_op.hpp	69.23% <0.00%> (-27.65%)	⬇️
include/exiv2/slice.hpp	69.64% <0.00%> (-21.89%)	⬇️
include/exiv2/error.hpp	60.71% <0.00%> (-4.81%)	⬇️
src/utils.cpp	38.46% <0.00%> (-1.93%)	⬇️
include/exiv2/value.hpp	82.96% <0.00%> (-0.55%)	⬇️
src/enforce.hpp	75.00% <0.00%> (+2.77%)	⬆️
src/getopt.cpp	67.30% <0.00%> (+5.76%)	⬆️
include/exiv2/metadatum.hpp	88.88% <0.00%> (+16.16%)	⬆️

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[postscript-dev]

@Sturmflut: Thanks for contributing this.

If you have the time, would you be interested in also updating GIT_GUIDELINES.md? This has the same master/main problem.

[Sturmflut]

@Sturmflut: Thanks for contributing this.

If you have the time, would you be interested in also updating GIT_GUIDELINES.md? This has the same master/main problem.

Sure, see #2075.

[postscript-dev]

@Sturmflut: Great, thanks for working on that.