updating to v5

app.js

@@ -134,7 +134,7 @@ var formatTime = d3.timeFormat("%B%e, %Y at %-I:%M%p");
 var lastTransform = null;
 var zoom = d3.zoom().on('zoom', zoomCallback);
 
-d3.json('data.json', function(error, data){
+d3.json('data.json').then(function(data){
     runs = data;
     init();
 });

index.html

@@ -22,7 +22,7 @@
             <tbody>
             </tbody>
         </table>
-        <script src="d3.v4.min.js"></script>
+        <script src="https://d3js.org/d3.v5.min.js"></script>
         <script src="app.js" charset="utf-8"></script>
     </body>
 </html>