Add module 'updatenotification'.

modules/default/updatenotification/README.md

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+# Module: Update Notification
+The `updatenotification` module is one of the default modules of the MagicMirror.
+This will display a message whenever a new version of the MagicMirror application is available.
+
+## Using the module
+
+To use this module, add it to the modules array in the `config/config.js` file:
+````javascript
+modules: [
+	{
+		module: 'updatenotification',
+		position: 'top_center',	// This can be any of the regions.
+		config: {
+			// The config property is optional.
+			// See 'Configuration options' for more information.
+		}
+	}
+]
+````
+
+## Configuration options
+
+The following properties can be configured:
+
+<table width="100%">
+	<!-- why, markdown... -->
+	<thead>
+		<tr>
+			<th>Option</th>
+			<th width="100%">Description</th>
+		</tr>
+	<thead>
+	<tbody>
+		<tr>
+			<td><code>updateInterval</code></td>
+			<td>How often do you want to check for a new version? This value represents the interval in milliseconds.<br>
+				<br><b>Possible values:</b> Any value above <code>60000</code> (1 minute);
+				<br><b>Default value:</b> <code>600000</code> (10 minutes);
+			</td>
+		</tr>
+	</tbody>
+</table>