Kubernetes-asyncio

* feat: check whether an object key is present on watch ([71](https://github.com/tomplus/kubernetes_asyncio/pull/71), [mickours](https://github.com/mickours))
* feat: merging kubeconfig files ([69](https://github.com/tomplus/kubernetes_asyncio/pull/69), [tomplus](https://github.com/tomplus))

* feat: switch to openapi-generator ([58](https://github.com/tomplus/kubernetes_asyncio/pull/58), [tomplus](https://github.com/tomplus))
* feat: add fieldSelector parameter to list/watch methods in custom objects spec ([gen/106](https://github.com/kubernetes-client/gen/pull/106))
* feat: upgrade to API spec from Kubernetes 1.13 ([58](https://github.com/tomplus/kubernetes_asyncio/pull/58), [tomplus](https://github.com/tomplus))

Breaking Changes:
* Model v1beta1WebhookClientConfig is renamed to AdmissionregistrationV1beta1WebhookClientConfig, to avoid naming conflict
with ApiextensionsV1beta1WebhookClientConfig introduced in: kubernetes/kubernetes67006
* Delete request's body parameter is optional kubernetes/kubernetes70032

* feat: watch improvement (context manager, close method) ([61](https://github.com/tomplus/kubernetes_asyncio/pull/61), [hubo1016](https://github.com/hubo1016))

* fix: use `yaml.safe_load`, `yaml.safe_dump` for security reasons ([57](https://github.com/tomplus/kubernetes_asyncio/pull/57), [tomplus](https://github.com/tomplus))

* feat: remove dependency to urllib3 from kube_config, pin urlllib>=1.23 due to CVE-2018-20060 ([56](https://github.com/tomplus/kubernetes_asyncio/pull/56), [tomplus](https://github.com/tomplus))

* fix: kubeconfig loading failure when server uri contains trailing slash ([53](https://github.com/tomplus/kubernetes_asyncio/pull/53), [tomplus](https://github.com/tomplus))
* feat: regenerate client with thread-pool optimization ([54](https://github.com/tomplus/kubernetes_asyncio/pull/54), [tomplus](https://github.com/tomplus))