Update README.md

Author: zibs

README.md

@@ -16,7 +16,7 @@ gem 'whenever', require: false
 
 ```sh
 $ cd /apps/my-great-project
-$ wheneverize .
+$ bundle exec wheneverize .
 ```
 
 This will create an initial `config/schedule.rb` file for you (as long as the config folder is already present in your project).