nginx: increase file size limit

Author: yolile

default.conf

@@ -3,7 +3,7 @@ server {
     listen  [::]:8080;
     server_name  localhost;
     server_tokens off;
-    client_max_body_size 10M;
+    client_max_body_size 20M;
 
     #access_log  /var/log/nginx/host.access.log  main;