add-env-option

[krazijames]

Summary

• Add -e, --env option.
• Parse "key=value" strings to an object.

[codecov]

Codecov Report

Merging #8 (851c3ab) into main (c596a67) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           23        27    +4     
  Branches         2         2           
=========================================
+ Hits            23        27    +4     

Impacted Files	Coverage Δ
src/parseArgs.js	100.00% <100.00%> (ø)

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