Add support for channels

bin/notifirc

         echo "usage: $self [options] [-l max_lines] [-L max_width] -f message_file|-"
         echo "options: [-h host] [-p port] [-n nick] [-c context] [-u user]"
         echo ""
+        echo "user can be user name but also channel name, in that case notifirc"
+        echo "will JOIN the channel first."
+        echo ""
         echo "Defaults for options can be defined as POSIX shell assignments under"
         echo "/etc/notifirc.rc or ~/.notifirc.rc. (E.g. 'nick=jdoe', 'max_width=40')."
         echo ""
     local message
     echo "NICK $nick"
     echo "USER $nick 8 * :notifirc bot"
+    if test "${user:0:1}" == '#'; then
+        echo "JOIN $user"
+    fi
     while read -r message;
     do
         echo "PRIVMSG $user :$message"