September 2020 - Energy Classification for listings and project units

Changes to the API since August 2020.

Added

Energy Classification field was added as optional to listing and project unit.

Updated endpoints are:

• Create a listing POST /listings
• Update an existing listing PATCH /listings/:id
• Get information about a listing GET /listings/:id
• Create a project unit POST /projects/:project_id/units
• Update an existing project unit PATCH /projects/:project_id/units/:project_unit_id
• Get information about a project unit GET /projects/:project_id/units/:project_unit_id