chore: PEP8 fix

[vkmrishad]

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 inline documentation to the code I modified

Short description of what this PR does:

• PEP8 fix

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

[SendGridDX]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #87 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #87   +/-   ##
=======================================
  Coverage   99.32%   99.32%           
=======================================
  Files           2        2           
  Lines         149      149           
=======================================
  Hits          148      148           
  Misses          1        1

Impacted Files	Coverage Δ
test/__init__.py	100% <ø> (ø)	⬆️
smtpapi/__init__.py	98.71% <100%> (ø)	⬆️

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[vkmrishad]

@misterdorm

[vkmrishad]

@misterdorm
Please add available labels and merge this PR

[thinkingserious]

Hello @vkmrishad,

Thanks again for the PR!

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Team SendGrid DX

[vkmrishad]

@thinkingserious @misterdorm
Thank you