Docs: Added new config variable to config example in readme. (#11)

Author: BrandonOldenhof

README.md

@@ -25,6 +25,8 @@ This is the contents of the published config file:
 ```php
 return [
 
+    'enabled' => env('BLADE_CACHE_DIRECTIVE_ENABLED', true),
+
     'ttl' => env('BLADE_CACHE_DIRECTIVE_TTL', 3600),
 
 ];