1.21.0

Add support for root blkdev kmod detection.

Add support for usage with livecds.

Improve log output for ignord kmods which are builtin.

Improve docs.

What's Changed

• add squashfs (overlayfs) module by @desultory in #68
• update versions, make squashfs/overlayfs mounts fail to rd_fail by @desultory in #69
• convert squashfs module to livecd module by @desultory in #70
• improve livecd module logging, cmdline usage by @desultory in #71
• Autodetect root block device drivers by @desultory in #72
• autodetect virtio block drivers by @desultory in #73

Full Changelog: 1.20.0...1.21.0