UX: Use a step size of 1.

UX: Use a step size of 1.

Follow up to 634a213e6d2a1a00a021ed65b7f3c2e9ca4762a5.

diff --git a/app/assets/javascripts/admin/components/admin-graph.js.es6 b/app/assets/javascripts/admin/components/admin-graph.js.es6
index 45f016a..3f92858 100644
--- a/app/assets/javascripts/admin/components/admin-graph.js.es6
+++ b/app/assets/javascripts/admin/components/admin-graph.js.es6
@@ -40,10 +40,7 @@ export default Ember.Component.extend({
             {
               display: true,
               ticks: {
-                callback: label => {
-                  if (label >= 1) return number(label);
-                },
-                suggestedMin: 0
+                stepSize: 1
               }
             }
           ]

GitHub sha: 4fa8fe57