Create proxy.conf

nginx-proxy/nginx-proxy#694 (comment)
Signed-off-by: Vitor Mattos <vitor@php.rio>

Author: vitormattos

volumes/conf.d/proxy.conf

@@ -0,0 +1,3 @@
+proxy_buffer_size          128k;
+proxy_buffers              4 256k;
+proxy_busy_buffers_size    256k;