add apply patch type (#579)

src/KubernetesClient/Kubernetes.Header.cs

@@ -37,6 +37,8 @@ namespace k8s
                     return MediaTypeHeaderValue.Parse("application/merge-patch+json; charset=utf-8");
                 case V1Patch.PatchType.StrategicMergePatch:
                     return MediaTypeHeaderValue.Parse("application/strategic-merge-patch+json; charset=utf-8");
+                case V1Patch.PatchType.ApplyPatch:
+                    return MediaTypeHeaderValue.Parse("application/apply-patch+yaml; charset=utf-8");
                 default:
                     throw new ArgumentOutOfRangeException(nameof(body.Type), "");
             }

src/KubernetesClient/V1Patch.cs

@@ -27,6 +27,11 @@ namespace k8s.Models
             /// content type application/strategic-merge-patch+json
             /// </summary>
             StrategicMergePatch,
+
+            /// <summary>
+            /// content type application/apply-patch+yaml
+            /// </summary>
+            ApplyPatch,
         }
 
         public PatchType Type { get; private set; }