fix gzip quantity: "q=0." and "q=1." are valid values according to RFC
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 0069245..bbb9311 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -2309,7 +2309,7 @@
         return 0;
     }
 
-    if (q > 100 || n == 0 || n > 3) {
+    if (q > 100 || n > 3) {
         return 0;
     }