It's public domain

Signed-off-by: Takeshi Banse <takebi@laafc.net>
Update README.md

Signed-off-by: Takeshi Banse <takebi@laafc.net>
Add "backward-kill-line" to afu_zles so that candidate characters are removed on "backward-kill-line"
Comment out one line to show comp candidates on inserting a space
Remove "kill-line" from afu_zles