Correct attribution links formating

[ghost]

Fixes #671

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:

• Change attribution links into bullet points to match CoC in other Sendgrid repos.

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

[ghost]

@misterdorm Rebased to v4 branch from #672

[codecov]

Codecov Report

Merging #715 into v4 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v4     #715   +/-   ##
=======================================
  Coverage   84.35%   84.35%           
=======================================
  Files          36       36           
  Lines         965      965           
  Branches      107      107           
=======================================
  Hits          814      814           
  Misses         93       93           
  Partials       58       58

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[thinkingserious]

Hello @PyroclasticMayhem,

Thanks again for the PR!

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Team SendGrid DX