Update composer.json

Author: Igor Chepurnoy

composer.json

@@ -13,9 +13,12 @@
       "email": "igorzfort@gmail.com"
     }
   ],
+  "require": {
+    "yiisoft/yii2": "*"
+  },
   "autoload": {
     "psr-4": {
       "yii2mod\\selectize\\": ""
     }
   }
-}
+}