add replicas to deploy

Author: James Lee

prod.yml

@@ -1,11 +1,10 @@
-version: '3.0'
+version: "3.0"
 services:
   dockerapp:
     image: jleetutorial/dockerapp
     ports:
       - "5000:5000"
     depends_on:
       - redis
-
   redis:
     image: redis:3.2.0