Update readertoc.lua
Update readertoc.lua

Add "pages left to next chapter" to minibar
ashhher3/koreader,pazos/koreader,koreader/koreader,koreader/koreader,NiLuJe/koreader,NiLuJe/koreader,robert00s/koreader,Hzj-jie/koreader,mihailim/koreader,poire-z/koreader,noname007/koreader,frankyifei/koreader,poire-z/koreader,chihyang/koreader,NickSavage/koreader,Markismus/koreader,Frenzie/koreader,mwoz123/koreader,Frenzie/koreader,ashang/koreader,lgeek/koreader,chrox/koreader,houqp/koreader,apletnev/koreader