updated link to kccna18 video (#174)

either https://www.youtube.com/watch?v=U7C5SpRtK74&list=PLj6h78yzYM2PZf9eA7bhWnIh_mK1vyOfU&index=346 or https://www.youtube.com/watch?v=U7C5SpRtK74

README.md

@@ -50,4 +50,4 @@ Your feedback is always welcome.
 
 [kccna18-event]: https://kccna18.sched.com/event/GrXC/on-the-oss-path-to-full-observability-with-grafana-david-kaltschmidt-grafana-labs
 [kccna18-slides]: https://speakerdeck.com/davkal/on-the-path-to-full-observability-with-oss-and-launch-of-loki
-[kccna18-video]: https://www.youtube.com/watch?v=tpJRG_ijKe0
+[kccna18-video]: https://www.youtube.com/watch?v=U7C5SpRtK74&list=PLj6h78yzYM2PZf9eA7bhWnIh_mK1vyOfU&index=346