Update README.md

Author: zigzagdev

README.md

@@ -62,7 +62,7 @@ php artisan world-heritage:import-japanese-names --force
 ## Testing
 
 ```bash
-php artisan test
+./vendor/bin/phpunit ./app
 ```
 
 ## Architecture Overview
@@ -121,4 +121,4 @@ php artisan test
 | Role | Repository |
 |---|---|
 | Frontend | https://github.com/zigzagdev/world-heritage-frontend |
-| Backend API | https://github.com/zigzagdev/world-heritage-api |
+| Backend API | https://github.com/zigzagdev/world-heritage-api |