Readme fixes.

Author: dmitry-ivanov

README.md

@@ -163,7 +163,7 @@ class ExampleCommand extends Command
 
 ### Custom mutex file storage
 
-If you're using `file` strategy, mutex files will be stored at `storage/app` folder, by default. However, you can change storage
+If you're using `file` strategy, mutex files will be stored at the `storage/app` folder, by default. However, you can change storage
 folder by overriding `getMutexFileStorage` method in your command:
 
 ```php