Jsonpath library that no longer used in the code

[hookenz]

The composer.json references a jsonpath library that is no longer used in the code.

However, if I'd like to use both this library and the newer version of jsonpath library I cannot because the version is held back by this lib.

Please remove it the reference in composer.

[hookenz]

PR: https://github.com/travisghansen/kubernetes-client-php/pull/15

[travisghansen]

It is used here: https://github.com/travisghansen/kubernetes-client-php/blob/master/src/KubernetesClient/Config.php