Fixes #

Checklist

I have read the SendGrid Contributor License Agreement (CLA)
I have read the [Contribution Guide] and my PR follows them.
My branch is up-to-date with the master branch.
I have added tests that prove my fix is effective or that my feature works
I have added necessary documentation (if appropriate)

All the functions created/modified in this PR contain relevant docstrings.

Short description of what this resolves:

Changes proposed in this pull request:

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