'yiisoft/yii2' package dependency version switched to 'dev'

composer.json

@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": ">=2.0.x-dev",
         "bower-asset/bootstrap": "3.3.* | 3.2.* | 3.1.*"
     },
     "autoload": {