upgrade nginx to 1.11.3 in makefile

Makefile

@@ -3,7 +3,7 @@
 
 update-dependencies:
 	docker pull jwilder/docker-gen:0.7.3
-	docker pull nginx:1.9.12
+	docker pull nginx:1.11.3
 	docker pull python:3
 	docker pull rancher/socat-docker:latest
 	docker pull appropriate/curl:latest