Fix so that git verification works on Apple git versions

[joannaskao]

Apple's git version looks like git version 2.21.0 (Apple Git-122)
rather than just git version 2.24.0

[codecov-io]

Codecov Report

Merging #31 into master will decrease coverage by 1.69%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master     #31     +/-   ##
========================================
- Coverage      80%   78.3%   -1.7%     
========================================
  Files           1       4      +3     
  Lines          70     106     +36     
  Branches       24      32      +8     
========================================
+ Hits           56      83     +27     
- Misses          4       9      +5     
- Partials       10      14      +4

Impacted Files	Coverage Δ
src/util.ts	69.23% <100%> (ø)
src/vault.ts	85.71% <0%> (ø)
src/help.ts	100% <0%> (ø)

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[aendra-rininsland]

LGTM 👍