[COMAC-221] Change kubernetes-synchronizer to use > kube v 1.15

Change-Id: I93e1da2faece42c343758f5fb6cb56c3c693b2f9
diff --git a/xos/synchronizer/steps/sync_kubernetes_service.py b/xos/synchronizer/steps/sync_kubernetes_service.py
index 0b929ee..883a399 100644
--- a/xos/synchronizer/steps/sync_kubernetes_service.py
+++ b/xos/synchronizer/steps/sync_kubernetes_service.py
@@ -25,7 +25,7 @@
     provides = [KubernetesService]
     observes = KubernetesService
 
-    max_version = "1.14"
+    max_version = "1.15"
     [expected_major, expected_minor] = max_version.split(".")
 
     def __init__(self, *args, **kwargs):