v2.20.0

• chore(dashviewer): change video end metric to lag ratio (#1074) (9baf0b2), closes #1074
• chore(release): 2.20.0 (a96cb50)
• feat(dashviewer): Video performance instrumentation (#1071) (ed492c1), closes #1071 #2
• fix(viewer): Pause audio instead of muting it if autoplay is prevented (#1068) (09b22cf), closes #1068
• fix(viewer): Re-enable support for range requests for most users (#1072) (83424d0), closes #1072