v4.0.0

Bug Fixes

• request, response events are now forwarded from playlist formats (868213a), closes #671
• fix isLive check for some formats (f3af856)
• fix fps for format 278 (d4b7542)
• show more detailed error when trying to download future livestreams (fa80752)
• sort formats that are playlist or have contentLength higher (0d27df3), closes #163 #705
• types: add a couple more format properties (d58ce69)

Code Refactoring

• fully remove callback support (c483650)
• fully remove deprecated properties (241f73d)

Features

• include adaptive formats that would be overwritten by playlist formats (d2d7f94), closes #671

BREAKING CHANGES

• some formats, particularly in livestreams, may appear twice with the
  same itag, but different urls.
• support for callbacks in getInfo and getBasicInfo has been
  removed, use promises or async/await
• deprecated properties that gave a deprecated warning have been
  removed, these properties were moved into info.videoDetails
• default format sorting has changed. with no options, you may no
  longer get one that has both audio and video on some videos.