Merge pull request #541 from sendgrid/develop

deploy 👽
Merge pull request #543 from sendgrid/develop

fix DELETE method
Merge pull request #544 from sendgrid/develop

deploy list assist video
Merge pull request #546 from sendgrid/develop

deploy 🎁
Merge pull request #547 from sendgrid/develop

Deploy 💋
Merge pull request #551 from sendgrid/develop

deploy 🐳
Fix typos in perl code block for setting SMTPAPI header JSON
Merge pull request #552 from pbdeuchler/master

Fix typos in perl code block for setting SMTPAPI header JSON
Merge remote-tracking branch 'origin/master' into develop