Increase POST request size (#6)

nginx-config/nginx.conf

@@ -110,6 +110,7 @@ http {
     resolver 8.8.8.8;
     listen 80;
     server_name _;
+    client_max_body_size 1G;
 
     location / {
         return 200 'This is a caching service for gitub:  https://github.com/Azure/github-nginx-cache/';