FIX: Don't show timeline when less than 3 posts

app/assets/javascripts/discourse/widgets/topic-timeline.js.es6

@@ -205,7 +205,11 @@ export default createWidget('topic-timeline', {
       }));
     }
 
-    return [h('div.timeline-controls', controls),
+
+    const result = [ h('div.timeline-controls', controls) ];
+    const stream = attrs.topic.get('postStream.stream');
+    if (stream.length > 2) {
+      return result.concat([
         this.attach('link', {
           className: 'start-date',
           rawLabel: tinyDateYear(createdAt),
@@ -218,6 +222,9 @@ export default createWidget('topic-timeline', {
           label: 'topic.timeline.now',
           action: 'jumpBottom'
         })
-           ];
+      ]);
+    }
+
+    return result;
   }
 });