message: Add docs for "data-vv-scope" attribute
  * Add docs for "data-vv-scope" attribute
  This commit documents the "data-vv-scope" attribute.
  * Improve "Attribute" column width
diff: data-* attributes provide an alternate interface for the plugin to specify what exactly should happen, providing a simple and Vue version-compatible API. They are useful if you do not like to pass complex expressions to the directive.
  -|Attribute|Description|
  +| Attribute &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | Description |
  | :--- | :--- |
  -|<nobr>data-vv-as</nobr>|Specifies a pretty name for the field.|
  -|<nobr>data-vv-delay</nobr>|Specifies the delay amount in milliseconds for triggering the validation.|
  -|<nobr>data-vv-name</nobr>|Specifies a name for the field, used in components validation and as a fallback name for inputs.|
  -|<nobr>data-vv-value-path</nobr>|Specifies the value path within a component $data to retrieve the component current value. Only used for components.|
  -|<nobr>data-vv-validate-on</nobr>|Used to specify a list of event names separated by pipes, the default varies by the type of the input.|
  +| data-vv-as | Specifies a pretty name for the field. |
  +| data-vv-delay | Specifies the delay amount in milliseconds for triggering the validation. |
  +| data-vv-name | Specifies a name for the field, used in components validation and as a fallback name for inputs. |
  +| data-vv-scope | Specifies a scope for the field. See [here](../examples/scopes.md) for more information about scopes. |
  +| data-vv-value-path | Specifies the value path within a component $data to retrieve the component current value. Only used for components. |
  +| data-vv-validate-on | Used to specify a list of event names separated by pipes, the default varies by the type of the input. |
  