Omise

This version fixes Schedule API getting wrong response when it destroyed.

* [Fixed] Schedule API return proper response when it destroyed.

This version adds support for Receipt API, and Source API.

* [Fixed] Allow customer to be able to retrieve customer list.
* [Changed] Split test classes to each file.
* [Changed] Split request class to new file.

This version adds support for Receipt API, and Source API.

* [Added] Add Receipt API.
* [Added] Add Source API.

This version adds support for Forex API, and Search API, Schedule API and Occurrence API and drop and add support Python new version.

* [Added] Add Forex API.
* [Added] Add Search API.
* [Added] Add Schedule API.
* [Added] Add Occurrence API.
* [Changed] Drop support Python 2.6 and add support Python 3.6.

This version adds support for link API.

* [Added] Add Link API support.

This version fixes compatibility with [Requests](https://github.com/kennethreitz/requests/) library version 2.12.1 and above.

* [Fixed] Compatibility with Requests 2.12.1.