[youtube] add support for format 313 (new 2160p vp9 webm)

[sdsucks]

F:>youtube-dl -F Vx3U_0bGxsQ
[youtube] Confirming age
[youtube] Vx3U_0bGxsQ: Downloading webpage
[youtube] Vx3U_0bGxsQ: Downloading video info webpage
[youtube] Vx3U_0bGxsQ: Extracting video information
[youtube] Vx3U_0bGxsQ: Downloading DASH manifest
[info] Available formats for Vx3U_0bGxsQ:
format code extension resolution note
139 m4a audio only DASH audio 49k , audio@ 48k (22050Hz), 1.84MiB (worst)
140 m4a audio only DASH audio 129k , audio@128k (44100Hz), 4.89MiB
171 webm audio only DASH audio 130k , audio@128k (44100Hz), 4.61MiB
172 webm audio only DASH audio 189k , audio@256k (44100Hz), 6.54MiB
141 m4a audio only DASH audio 255k , audio@256k (44100Hz), 9.72MiB
278 webm 82x144 DASH video 41k , webm container, VP9, video only, 1.35MiB
160 mp4 82x144 DASH video 110k , video only, 4.13MiB
242 webm 136x240 DASH video 235k , video only, 6.29MiB
133 mp4 136x240 DASH video 246k , video only, 9.31MiB
243 webm 202x360 DASH video 452k , video only, 12.01MiB
134 mp4 202x360 DASH video 604k , video only, 14.61MiB
244 webm 270x480 DASH video 822k , video only, 21.84MiB
135 mp4 270x480 DASH video 1106k , video only, 29.28MiB
247 webm 406x720 DASH video 1656k , video only, 46.04MiB
136 mp4 406x720 DASH video 2206k , video only, 58.08MiB
248 webm 608x1080 DASH video 2969k , video only, 84.16MiB
137 mp4 608x1080 DASH video 4130k , video only, 108.85MiB
271 webm 810x1440 DASH video 7761k , video only, 193.06MiB
264 mp4 810x1440 DASH video 8262k , video only, 231.95MiB
272 webm 1216x2160 DASH video 22998k , video only, 553.00MiB
266 mp4 1296x2160 DASH video 13803k , h264, video only, 418.14MiB
138 mp4 2160x2160 DASH video 24303k , video only, 899.05MiB
313 unknown_videounknown
17 3gp 176x144
36 3gp 320x240
5 flv 400x240
43 webm 640x360
18 mp4 640x360
22 mp4 1280x720 (best)

[jaimeMF]

Thanks, will be fixed in the next version.