Add documentation

• Add documentation with example
• Add status constant to Job model

Add tests

• Add tests

Add support for return Job

• Add Response, Job and Hypermedia models
• Return a Job when changing status of a conversion
• Add methods to update or get response of a Job
• Fix bug in encoder

Change to UTC timezone

Change to UTC timezone

Add support for rejecting conversions

• Add support for rejecting conversions

Add support for multiple Symfony versions

• Add support for Symfony 3.4, 4 and 5.

Initial release with basic API methods

Alpha release with the following functionalities:

• Create and approve conversions