v0.6.2

Allow for usage of symfony/yaml 7

v0.6.1

Allow tcp:// to be used to define a remote_socket when constructing a new Client for backwards compatibility.

v0.6

Remove support for PHP < 7.2.
Switch tests to PHPUnit.
Change to use GuzzleHttp\Client.
Add an IppRequest builder.
Add a class of Operation types with consts for easier development.