Update README.md

Author: tuyakhov

README.md

@@ -12,7 +12,7 @@ The preferred way to install this extension is through [composer](http://getcomp
 Either run
 
 ```
-php composer.phar require --prefer-dist tuyakhov/yii2-youtube "dev-master"
+php composer.phar require --prefer-dist tuyakhov/yii2-json-api "dev-master"
 ```
 
 or add