explicitly specify parameter name in git_ls()

[jeroen]

Argument order will change in future gert

[codecov[bot]]

Codecov Report

Merging #125 (b153962) into master (de85178) will decrease coverage by 2.09%. The diff coverage is 37.77%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   69.46%   67.37%   -2.10%     
==========================================
  Files          16       16              
  Lines        1392     1419      +27     
==========================================
- Hits          967      956      -11     
- Misses        425      463      +38     

Impacted Files	Coverage Δ
R/github.R	24.73% <0.00%> (ø)
R/worcs_badge.R	0.00% <0.00%> (ø)
R/check_installation.R	72.13% <39.53%> (-14.05%)	:arrow_down:

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[cjvanlissa]

Thank you @jeroen !