Update sample for y domain update

htdocs/samples/domain_y.html

@@ -19,18 +19,21 @@
             ['data1', -1030, -1200, 1000],
             ['data2', -1150, -220, -1110]
           ],
+          labels: true,
       },
       allPositiveData = {
           columns: [
             ['data1', 1030, 1200, 1100],
             ['data2', 2050, 2020, 2010]
           ],
+          labels: true,
       },
       allNegativeData = {
           columns: [
             ['data1', -1030, -2200, -2100],
             ['data2', -1150, -2010, -1200]
-          ]
+          ],
+          labels: true,
       }
 
       var chart1 = c3.generate({