Explain --open-app more

[benwiley4000]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update
• docs update

Motivation / Use-Case

Followup to my comment here. Makes the --open-app argument a bit easier to use correctly.

[codecov]

Codecov Report

Merging #73 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #73   +/-   ##
======================================
  Coverage    92.7%   92.7%           
======================================
  Files           7       7           
  Lines         274     274           
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  Hits          254     254           
  Misses         20      20

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[shellscape]

Rejecting this for a number of reasons:

1. you didn't update the actual CLI
2. we don't need that level of verbosity in the CLI output when the README exists
3. The link should go into the README under the open option. (the README option still needs to be updated with the array info)
4. You don't need to pass a JSON array, it'll be interpolated as a string from the CLI via meow and parsed normally:

JSON.parse('["a", "b", "c"]')
// --> [ 'a', 'b', 'c' ]

[benwiley4000]

Didn't know about the meow thing! Thanks. I find the concept of passing an array to a cli puzzling, but if it works, it works!