Update the output log message with more descriptive qualities

[ameliav]

🗣 Description

This PR resolves issue #43 and adds a more descriptive output log message in CLI for the generated report.

💭 Motivation and context

To make the log message unique to the assessment and location of the output directory.

🧪 Testing

Run the script as usage suggests and verify output references are replaced.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Finalize version.

✅ Post-merge checklist

• Create a release.

[coveralls]

Pull Request Test Coverage Report for Build 6226865899

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 6226574428:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls

[dav3r]

Reminder that if a checklist item in the PR template does not apply, you should delete it, rather than check the box (which implies that something was done for that item). In this case, you can delete the "Revert dependencies to default branches." item because this PR did not require the use of any test branches of dependent repositories.

Also, I unchecked the "Finalize version." checkbox because that has not been done yet for this PR. If you're unclear about what this means, please see #37 (comment). If you have any further questions, I'm happy to answer them.

[dav3r]

Approved, though I suggest one very small change. 👍