Bump Docker version latest to v2.5-r2

Author: opomuc

Dockerfile

@@ -17,7 +17,7 @@ RUN addgroup -S nginx \
 
 ENV NGINX_VERSION=1.11.1 \
     NGINX_UPSTREAM_MODULE_URL=https://github.com/tarantool/nginx_upstream_module.git \
-    NGINX_UPSTREAM_MODULE_COMMIT=863e9bdd0ebbf94c0b5449cdbf686b316ba674b8 \
+    NGINX_UPSTREAM_MODULE_COMMIT=3736239b51cc48776ee49088d7d674ff37791544 \
     NGINX_GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8
 
 ENV NGINX_LUA_MODULE_URL=https://github.com/openresty/lua-nginx-module \