Allow slashes in branches in the repos.md file

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #2297 (fbdcca3) into master (a39f91a) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2297      +/-   ##
==========================================
+ Coverage   77.83%   77.89%   +0.05%     
==========================================
  Files         135      135              
  Lines        2292     2289       -3     
  Branches       49       52       +3     
==========================================
- Hits         1784     1783       -1     
+ Misses        508      506       -2     

Impacted Files	Coverage Δ
...org/scalasteward/core/application/StewardAlg.scala	40.00% <100.00%> (-4.45%)	⬇️
...in/scala/org/scalasteward/core/vcs/data/Repo.scala	100.00% <100.00%> (ø)

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