macOS support

[dalance]

No description provided.

[codecov-io]

Codecov Report

Merging #9 into master will decrease coverage by 19.72%.
The diff coverage is 24.13%.

@@             Coverage Diff             @@
##           master       #9       +/-   ##
===========================================
- Coverage   86.08%   66.35%   -19.73%     
===========================================
  Files          59       68        +9     
  Lines        1286     1831      +545     
===========================================
+ Hits         1107     1215      +108     
- Misses        179      616      +437

Impacted Files	Coverage Δ
src/util.rs	94.44% <ø> (ø)	⬆️
src/columns/udp_port.rs	46.66% <0%> (-27.02%)	⬇️
src/columns/threads.rs	68.75% <0%> (-31.25%)	⬇️
src/columns/ppid.rs	68.75% <0%> (-31.25%)	⬇️
src/columns/tty.rs	53.84% <0%> (-39.49%)	⬇️
src/columns/user.rs	54.16% <0%> (-32.5%)	⬇️
src/columns/start_time.rs	66.66% <0%> (-33.34%)	⬇️
src/columns/docker.rs	32.3% <0%> (-27.7%)	⬇️
src/columns/cpu_time.rs	61.9% <0%> (-38.1%)	⬇️
src/columns/command.rs	42.55% <0%> (-34.37%)	⬇️
... and 60 more

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