Version Bump v2.2.1: When Content-Type is not application/json, do no…

…t JSON encode the request body

Version Bump v2.2.0: Ability to set the Content-Type header

Version Bump: v2.1.1: Pull request sendgrid#11

Version Bump 2.1.0: Automatically add Content-Type: application/json …

…when there is a request body

Helper function for README

Version Bump v1.2.4

Version Bump v1.2.4

Version Bump v1.2.4

Merge pull request sendgrid#9 from sendgrid/fully-fluent

Fully fluent

Version Bump v1.1.2