test: Added unittest to check for specific repo files

[mptap]

Fixes # #58

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• Adds unittest to check for specific repo files mentioned in Add unittest to check for specific repo files #58

If you have questions, please send an email to Sendgrid, or file a Github Issue in this repository.

[mbernier]

BEAUTIFULLY done!

This is awesome. Thank you so much!!

Just so you know, we have this same issue on another Node library if you're interested:

• Add unittest to check for specific repo files sendgrid-nodejs#565

[thinkingserious]

Hello @mptap,

Thanks again for the PR!

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