Merge pull request #1766 from lukapaunovic/patch-33

Update nginx.conf

install/ubuntu/18.04/nginx/nginx.conf

@@ -50,6 +50,7 @@ http {
 
     # Compression
     gzip                on;
+    gzip_vary           on;
     gzip_static         on;
     gzip_vary           on;
     gzip_comp_level     6;