Allow up to 3 MiB payload in nginx, privatebin defaults to 2 MiB

etc/nginx/nginx.conf

@@ -66,6 +66,9 @@ http {
     # since TCP frames are filled up before being sent out.
     tcp_nopush      on;
 
+    # Allow up to 3 MiB payload, privatebin defaults to 2 MiB.
+    client_max_body_size 3M;
+
     # Load even moar configs
     include /etc/nginx/conf.d/*.conf;
     include /etc/nginx/sites-enabled/*.conf;