Thumbnail fetch failed.

Hi,

I've found youtube's API returns different params about thumbnail. XCDYouTubeKit is loading the these keys: NSString smallThumbnail = info[@"thumbnail_url"] ?: info[@"iurl"]; NSString mediumThumbnail = info[@"iurlsd"] ?: info[@"iurlhq"] ?: info[@"iurlmq"]; NSString *largeThumbnail = info[@"iurlmaxres"];

However I saw youtube returns thumbnail in this way: "thumbnail_url" = "https://i.ytimg.com/vi/MHP6d-nGA14/default.jpg"; //This is small thumbnail and "player_response" = "{\"videoDetails\":{\"thumbnail\":{\"thumbnails\":[{\"url\":\"https://i.ytimg.com/vi/MHP6d-nGA14/hqdefault.jpg?custom=true\\u0026w=168\\u0026h=94\\u0026stc=true\\u0026jpg444=true\\u0026jpgq=90\\u0026sp=67\\u0026sigh=YBUQNNPfX5UrBg83K0UvRJm-xA4\",\"width\":168,\"height\":94},{\"url\":\"https://i.ytimg.com/vi/MHP6d-nGA14/hqdefault.jpg?custom=true\\u0026w=196\\u0026h=110\\u0026stc=true\\u0026jpg444=true\\u0026jpgq=90\\u0026sp=67\\u0026sigh=YDuaX_2in-nL2X1rhmhUxo4RfWQ\",\"width\":196,\"height\":110},{\"url\":\"https://i.ytimg.com/vi/MHP6d-nGA14/hqdefault.jpg?custom=true\\u0026w=246\\u0026h=138\\u0026stc=true\\u0026jpg444=true\\u0026jpgq=90\\u0026sp=67\\u0026sigh=rjrxmnAgupgqWnh0NuSx1_g8EOA\",\"width\":246,\"height\":138},{\"url\":\"https://i.ytimg.com/vi/MHP6d-nGA14/hqdefault.jpg?custom=true\\u0026w=336\\u0026h=188\\u0026stc=true\\u0026jpg444=true\\u0026jpgq=90\\u0026sp=67\\u0026sigh=xQoZ-AgKSEdfyXL9GKffkqv4cQI\",\"width\":336,\"height\":188}]}},\"adSafetyReason\":{\"isRemarketingEnabled\":true,\"isFocEnabled\":true}}";

As you can see, more thumbnail info are in another key named "player_response".

Is it possible we update the kit to support the new "player_response" key to fetch more thumbnails?

PS: The complete youtube response: Printing description of info: { "account_playback_token" = "QUFFLUhqbWlZLWZXbWFTMU5MdWhyTUxIWjdIZzVzbE9PQXxBQ3Jtc0tuN2VjeTc1N0ZVSXB0SklUa0F3RE1HVVVMMXN1RGI3WEVscnFHcVhNb3hoR1EyQnl0V2QzZkVINFF0VkJPbWZwRXpkWHVyUHN4c052aURSbHZrcmczS1d0Y2FjcTFfWUlVVGdDYlBmd0lPOEZuY3ZQSQ=="; "adaptive_fmts" = "fps=30&lmt=1458192395826332&projection_type=1&bitrate=2338434&init=0-713&index=714-1333&clen=74472421&quality_label=720p&xtags=&itag=136&type=video%2Fmp4%3B 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0xced / XCDYouTubeKit

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