remove alias supreme_kai -> kaioushin
mass update kaioushin -> shin_(dragon_ball)
Shin is apparently the Supreme Kai's official name now.
http://www.toei-anim.co.jp/tv/dragon_s/special/07.html
https://pbs.twimg.com/media/C6YGwReVAAAMEdM.jpg
EDIT: The bulk update request #1891 (forum #153136) has been approved by @Hillside_Moose.
Updated by DanbooruBot