Pin sysinfo to the lowest supported version

[jasonozias]

• Pin sysinfo to 0.19

Fixes #80

[codecov]

Codecov Report

Merging #81 (562853a) into master (429f0c2) will increase coverage by 0.21%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master       #81      +/-   ##
===========================================
+ Coverage   99.78%   100.00%   +0.21%     
===========================================
  Files          11        11              
  Lines         936       936              
===========================================
+ Hits          934       936       +2     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
src/feature/git.rs	100.00% <0.00%> (+1.41%)	⬆️

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