Edit in JSFiddle

riot.mount('rg-chart', {
	  chart: {
			type: 'line',
			data: {
				labels: ["January", "February", "March", "April", "May", "June", "July"],
				datasets: [{
					label: "My First dataset",
					fillColor: "rgba(220,220,220,0.2)",
					strokeColor: "rgba(220,220,220,1)",
					pointColor: "rgba(220,220,220,1)",
					pointStrokeColor: "#fff",
					pointHighlightFill: "#fff",
					pointHighlightStroke: "rgba(220,220,220,1)",
					data: [65, 59, 80, 81, 56, 55, 40]
				}, {
					label: "My Second dataset",
					fillColor: "rgba(151,187,205,0.2)",
					strokeColor: "rgba(151,187,205,1)",
					pointColor: "rgba(151,187,205,1)",
					pointStrokeColor: "#fff",
					pointHighlightFill: "#fff",
					pointHighlightStroke: "rgba(151,187,205,1)",
					data: [28, 48, 40, 19, 86, 27, 90]
				}]
			}
		}
	})
     <rg-chart></rg-chart>

        <script src="https://cdnjs.cloudflare.com/ajax/libs/riot/2.6.2/riot+compiler.min.js"></script>
        <script src="https://cdn.jsdelivr.net/riotgear/latest/rg.min.js"></script>        
        <script src="https://cdn.jsdelivr.net/chart.js/1.0.2/Chart.min.js"></script>