Feature request: "-v" reports the actual selected format

[keybounce]

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"-v" does not currently report what format was selected.
It would be nice if it did.

All I get right now is

[debug] Invoking downloader on u'https://r6---sn-a5meknee.googlevideo.com/videoplayback/id/c7446f8d75c579c9/itag/135/source/yt_otf/requiressl/yes/initcwndbps/430000/pl/21/nh/IgpwcjAxLmxheDE2KgkxMjcuMC4wLjE/mn/sn-a5meknee/mm/31/ms/au/mv/m/ratebypass/yes/mime/video%2Fmp4/otfp/1/otf/1/lmt/1465968767332073/key/dg_yt0/mt/1468462601/signature/576BFF6BA424965A3211CB2BE907DD43D27D5AF8.5CE0AC5B1DF1B9B45CA0ED1CA1DDAA5FF71020D6/upn/ObSsecJ6LH4/sver/3/fexp/9407157,9413138,9416126,9416891,9419451,9422596,9424134,9428398,9429856,9431012,9433096,9433380,9433946,9435526,9435876,9435922,9436635,9437066,9437078,9437552,9437742,9438663,9438731,9439601,9439652,9440364,9440376/ip/108.192.89.65/ipbits/0/expire/1468484485/sparams/ip,ipbits,expire,id,itag,source,requiressl,initcwndbps,pl,nh,mn,mm,ms,mv,ratebypass,mime,otfp,otf,lmt/'
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