Add the changelog entry for launches, speed and buffering on the timeline

changelog.d/1513-timeline-launches-speed-buffering.md

@@ -0,0 +1,5 @@
+- The timeline brings launches up as the time passes them, offers play
+  speeds from real time to a week a second, and waits on each weather frame
+  until it loads instead of running past it. The time now rides in a bubble
+  over the handle. Zooming out on the globe stops while the globe is still in
+  view instead of leaving it a speck (samehkhamis, #1513).