Fix typo in README

README.md

@@ -99,4 +99,4 @@ return [
 **NOTES:**
 - Yii won't create the database for you, this has to be done manually before you can access it.
 - Check and edit the other files in the `config/` directory to customize your application as required.
-- Refer to the README in the `tests` direcotry for information specific to basic application tests.
+- Refer to the README in the `tests` directory for information specific to basic application tests.