add function to get user amount of a channel

add function to get user amount of a channel
merge kaisatec 1
Merge remote-tracking branch 'upstream/master'

merge`.
add function to get user amount in a channel

add function to get user amount in a channel
add newfunction
add new function
add new function getUserAmount
Merge pull request #506 from kaisatec/master

add function to get user amount of a channel