Email w/ Custom Properties

• PR #3 : support for sending email with custom properties. thx @umsu2
• PR #2 : fix error formatting and exporting response thx @gordcurrie

Minor fixes

• response type was not exported
• fix error formatting

Contacts

• Create or update contact
• add / remove contact from list
• add / remove contact from Workflow

Single Send Email

• Fix expected http response code and expected response for single send email API

Initial release

Initial release of HubSpot Go client which currently supports:

• partial Single Send Email API