Gravity Forms Freshbooks Addon 2.8

- Added security enhancements.
- Added License GPL to the plugin header.
- Updated Plugin URI and Author URI to https in plugin header.
- Fixed a PHP notice which would occur when sending a request to Freshbooks.
- Removed temporary plugin page.

- Added security enhancements.

- Added License GPL to the plugin header
- Updated Plugin URI and Author URI to https in plugin header