Issue #547: Added comment for attachments to be base64 encoded #patch

[agnesjang98]

Fixes

Fixes #547
Closes #547

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:

• added comment to specify that attachments need to be base64 encoded

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 #604 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #604   +/-   ##
=======================================
  Coverage   86.61%   86.61%           
=======================================
  Files          32       32           
  Lines         979      979           
  Branches      131      131           
=======================================
  Hits          848      848           
  Misses         67       67           
  Partials       64       64

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[thinkingserious]

Hello @agnesjang98,

Thanks again for the PR!

We appreciate your contribution and look forward to continued collaboration. Thanks!

Team SendGrid DX