fix: exit the process after the command action is performed. Closes #805

[nilp0inter]

This fixes #805.

I had to disable this lint rule which I think does not apply in this particular case. But maybe I am wrong, I am not a JS developer.

• npm run test succeeds. (With some errors not introduced by this change)
• npm run lint succeeds. (With some errors not introduced by this change)
• Appropriate changes to README are included in PR.

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[nilp0inter]

@googlebot I signed it!

[PopGoesTheWza]

@nilp0inter I do not favor forcing process.exit() because:

• it is considered bad practice
• the root cause for delayed exits has not yet been identified

[nilp0inter]

That's ok. 😊