Typo fix

Author: juliyvchirkov

README.md

@@ -130,7 +130,7 @@ The `ngx_http_zstd_static_module` module allows sending precompressed files with
 ### zstd_static
 
 **Syntax:**	*zstd_static on | off | always;*  
-**Default:** *gzip_static off;*  
+**Default:** *zstd_static off;*  
 **Context:** *http, server, location*  
 
 Enables ("on") or disables ("off") checking the existence of precompressed files. The following directives are also taken into account: gzip_vary.