1.4

• Added new script mute that allows to remove background music from video;
• Dependencies were split into multiple extras - default package now contains only concat;
• [record] Require first-party OAuth token (from twitch.tv cookies);
• [record] Check possibility of concatenation while stream is still running and redownload live VOD if timeline is not complete;
• [record] Support multiple output formats (same as concat, but without piping);