Stop data flowing off graph

lib/bandwidth-chart.js

@@ -38,7 +38,7 @@ function pointsFromBandwidthData(values, numPoints) {
 
 module.exports = values => {
   if(values && values.length) {
-    const points = pointsFromBandwidthData(values, 57);
+    const points = pointsFromBandwidthData(values, 56);
     return chart(points, {
       width: 125,
       height: 20,