fix code style `There must be one blank line after the namespace declaration`

framework/base/Request.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\base;
+
 use Yii;
 
 /**

framework/caching/FileDependency.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\caching;
+
 use yii\base\InvalidConfigException;
 
 /**

framework/caching/GroupDependency.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\caching;
+
 use yii\base\InvalidConfigException;
 
 /**

framework/validators/PunycodeAsset.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\validators;
+
 use yii\web\AssetBundle;
 
 /**

framework/validators/ValidationAsset.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\validators;
+
 use yii\web\AssetBundle;
 
 /**

framework/widgets/ActiveFormAsset.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\widgets;
+
 use yii\web\AssetBundle;
 
 /**