[ci skip] update docker compose testing file

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

docker/docker-compose.testing.yml

@@ -1,4 +1,7 @@
-gorush:
+version: "2"
+
+services:
+  gorush:
     build: ./golang
     links:
       - redis
@@ -10,6 +13,6 @@ gorush:
       - ../:/app
     command: /bin/sh -c './docker/testing.sh'
 
-redis:
+  redis:
     build: ./redis
     privileged: true