Convert String to Uppercase and Lowercase in AngularJS

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.9/angular.min.js"></script>
<script type="text/javascript">
    var app = angular.module('MyApp', [])
    app.controller('MyController', function ($scope) {
        $scope.Customers = [
            { CustomerId: 1, Name: "John Hammond", Country: "united States" },
            { CustomerId: 2, Name: "Mudassar Khan", Country: "inDia" },
            { CustomerId: 3, Name: "Suzanne Mathews", Country: "France" },
            { CustomerId: 4, Name: "Robert Schidner", Country: "Russia" }
            ];
    });
</script>
<div ng-app="MyApp" ng-controller="MyController">
    <table border="1" cellpadding="0" cellspacing="0">
        <tr>
            <th>Customer Id</th>
            <th>Name</th>
            <th>Country Upper</th>
            <th>Country Lower</th>
        </tr>
        <tbody ng-repeat="m in Customers">
            <tr>
                <td>{{m.CustomerId}}</td>
                <td>{{m.Name}}</td>
                <td>{{m.Country | uppercase}}</td>
                <td>{{m.Country | lowercase}}</td>
            </tr>
        </tbody>
    </table>
</div>