Update README.md

README.md

@@ -107,7 +107,7 @@ Before each Discord session, students should watch videos corresponding to that
 - Live lectures
   - Concurrency 1 ([Zoom Recording][ZoomConcurrency1]) ([YouTube version][YouTubeConcurrency1])
   - Concurrency 2 ([Zoom Recording][ZoomConcurrency2]) ([YouTube version][YouTubeConcurrency2])
-  - Concurrency 3 ([Zoom Recording][ZoomConcurrency3])
+  - Concurrency 3 ([Zoom Recording][ZoomConcurrency3]) ([YouTube version][YouTubeConcurrency3])
 
 ### Actors 1
 
@@ -192,6 +192,7 @@ Information about exams organization will be communicated by email.
 [Zoom1]: https://epfl.zoom.us/rec/share/wKUHvD1vNyczKpb2e161QCnqi3BtURL5D9zfVie3iXqXmrsIbJ2lrl4cCO_1FgSx.ZfvYlrRfSAFFdMcq?startTime=1614170578000
 [ZoomConcurrency1]: https://epfl.zoom.us/rec/play/LzV8eccIFbEgHMi-DLJqynUus7chng8NYyR7XeA5Jjn_NGqkeAhIiTNsOLmIOp0XJHfjrNeB-XS6F5Fw.47WW7-mux-mqQZN8?startTime=1616586685000
 [ZoomConcurrency2]: https://epfl.zoom.us/rec/play/nIeJO-yRcbqmjzIZWU4yU3gQC5h8rQlebVxbWSUEP426NvwgSsmis9lOOyV-m7SjVqFV9ML0vggMDg5N.01wR77_gQbSIUv8b?autoplay=true
+[ZoomConcurrency3]: https://epfl.zoom.us/rec/share/Y-CKNw08e88aeAhRhApCePes-1PWj97C6x6imLRM_X4kepGNjMjZimwDXCd4wGuk.hEUUleJEvt8MClDx?startTime=1619005278000
 [YouTubeConcurrency1]: https://www.youtube.com/watch?v=5oUpSoUoII4
 [YouTubeConcurrency2]: https://www.youtube.com/watch?v=Jvo-vrxaGnk
-[ZoomConcurrency3]: https://epfl.zoom.us/rec/share/Y-CKNw08e88aeAhRhApCePes-1PWj97C6x6imLRM_X4kepGNjMjZimwDXCd4wGuk.hEUUleJEvt8MClDx?startTime=1619005278000
+[YouTubeConcurrency3]: https://www.youtube.com/watch?v=t4tqMzfvclk