fix update date message

fix cached update

add cached update

Merge remote-tracking branch 'origin/master'

add updatechecker

Update README.md

Update README.md

Update README.md

add /trashcanplus command alias

add config reload command

disable open/close trashcan if enable-throw-item-to-trash is disabled

Merge remote-tracking branch 'origin/master'

clean some mess

Update README.md

check if trashcan is full before adding new item