Bump Nginx image to v4.7.1

Signed-off-by: Riddhesh Sanghvi <[email protected]>

Author: mrrobot47

img-versions.json

@@ -3,7 +3,7 @@
     "easyengine/mailhog": "v4.6.5",
     "easyengine/mariadb": "v4.6.6",
     "easyengine/nginx-proxy": "v4.7.1",
-    "easyengine/nginx": "v4.7.0",
+    "easyengine/nginx": "v4.7.1",
     "easyengine/php": "v4.6.6",
     "easyengine/php5.6": "v4.6.6",
     "easyengine/php7.0": "v4.6.6",