fix repo

cluster/ingress-nginx/Chart.yaml

@@ -9,6 +9,6 @@ appVersion: 0.1.0
 dependencies:
 - name: ingress-nginx
   version: v1.13.0
-  repository: https://charts.jetstack.io
+  repository: https://kubernetes.github.io/ingress-nginx
   alias: ingress-nginx
   condition: ingress-nginx.enabled