v3.6 release - OAuth v2.0

This adds OAuth v2.0 support.

See migration instructions here: https://github.com/consolibyte/quickbooks-php/blob/master/README_OAUTHV1_TO_OAUTHV2.md

v3.5 Release

Adding support for updating estimates in QBO.

v3.4 Release

Merge pull request #204 from njcrawford/example_fix_2

Make sure example requests are queued as the authenticated user, part 2

v3.3 release

Added a troubleshooting script.

v3.2 release

Catch and handle 504 gateway timeouts gracefully.

3.1

Example of getting a charge with Payments API.

v3.0 Release

Example of getting a charge with Payments API.