fix: get dev version via os.Executable

[danielgtaylor]

This works better than os.Args[0] in some cases, e.g. when the command is aliased in some shells.

[codecov]

Codecov Report

Merging #137 (e908265) into main (d6c2b76) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #137   +/-   ##
=======================================
  Coverage   64.65%   64.65%           
=======================================
  Files          22       22           
  Lines        2405     2405           
=======================================
  Hits         1555     1555           
  Misses        685      685           
  Partials      165      165           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d6c2b76...e908265. Read the comment docs.