Added optional parameter "reason" for hangup: DELETE /channels/{channelId}

[vU97N]

Hi,
in methods Channel::hangup(), Channel::deleteChannel(), Channel::hangup() and Channel::deleteChannel() is not possible put reason value.
See https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Channels+REST+API#Asterisk13ChannelsRESTAPI-hangup.
So, I added optional parameter "reason" to these methods.
patch.zip