* added tests for getApproved

* added tests for getApproved

* added to changelog

* Corrected some linting issues

* Removed unneccrary tests as pointed out here: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/1820/commits/b49c2de086621745955be83a34a06de65e95c76c#r307927816

* Correct Changelog character

* Update ERC721.behavior.js