Update widget column type documentation

Author: Eugene Tupikov

README.md

@@ -122,6 +122,21 @@ Each column in a row can has their own type. Widget supports:
   - `radioList`
   - `textarea`
   - For more detail look at [Html helper class](http://www.yiiframework.com/doc-2.0/yii-helpers-html.html)
+- input widget (widget that extends from `InputWidget` class). For example, `yii\widgets\MaskedInput`
+
+For using widget as column input you may use the following code:
+
+```php
+        [
+            'name'  => 'phone',
+            'title' => 'Phone number',
+            'type' => \yii\widgets\MaskedInput::className(),
+            'options' => [
+                'class' => 'input-phone',
+                'mask' => '999-999-99-99'
+            ]
+        ]
+```
 
 ### JavaScript events
 This widget has following events:

docs/images/multiple-column.gif

@@ -19,12 +19,12 @@ class ExampleModel extends Model
 
         $this->schedule = [
             [
-                'day'       => 0,
+                'day'       => '27.02.2015',
                 'user_id'   => 1,
                 'priority'  => 1
             ],
             [
-                'day'       => 0,
+                'day'       => '27.02.2015',
                 'user_id'   => 2,
                 'priority'  => 2
             ],
@@ -67,18 +67,20 @@ use yii\helpers\Html;
         ],
         [
             'name'  => 'day',
-            'type'  => 'dropDownList',
+            'type'  => \kartik\date\DatePicker::className(),
             'title' => 'Day',
             'value' => function($data) {
                 return $data['day'];
             },
-            'defaultValue' => 1,
             'items' => [
                 '0' => 'Saturday',
                 '1' => 'Monday'
             ],
             'options' => [
-
+                'pluginOptions' => [
+                    'format' => 'dd.mm.yyyy',
+                    'todayHighlight' => true
+                ]
             ]
         ],
         [