delete PULL_REQUEST_TEMPLATE

[thepriefy]

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:

• It should be in .github folder which is already exist.

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

[codecov-io]

Codecov Report

Merging #506 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #506   +/-   ##
=====================================
  Coverage      83%    83%           
=====================================
  Files          30     30           
  Lines        1024   1024           
  Branches      160    160           
=====================================
  Hits          850    850           
  Misses         84     84           
  Partials       90     90

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[thinkingserious]

Hello @thepriefy,

Thanks again for the PR!

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

Team SendGrid DX

[thinkingserious]

Duplicate of #505