Fix #790

[johnpkennedy]

Fixes #790

Checklist

• I acknowledge that all my contributions will be made under the project's license
• 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:

Allow Unicode strings for the name associated with the email.

If you have questions, please send an email to Twilio SendGrid, or file a GitHub Issue in this repository.

[codecov]

Codecov Report

Merging #792 into master will increase coverage by 0.03%.
The diff coverage is 80%.

@@           Coverage Diff            @@
##           master   #792      +/-   ##
========================================
+ Coverage   79.97%    80%   +0.03%     
========================================
  Files          69     69              
  Lines        2012   2016       +4     
  Branches      338    338              
========================================
+ Hits         1609   1613       +4     
  Misses        204    204              
  Partials      199    199

Impacted Files	Coverage Δ
sendgrid/helpers/mail/email.py	95.06% <80%> (+0.25%)	⬆️

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[thinkingserious]

Hello @johnpkennedy,

Thanks again for the PR!

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Team SendGrid DX