code: function cmdHelp(command) {
          let ext = '';
          if (command.args && command.args.length > 0) {
              ext = command.args.join(' ');
          }
          if (ext && helpTopics[ext]) {
              const txt = `Help topic for \`${ext}\`\n\n${helpTopics[ext]}` +
                  '\n\nIssue the `help` command without any parameters to see all available commands';
              command.reply(txt);
  
          } else {
              const help = `${getCommandHelps()}\n\n\\* Help topic available.\n\nIssue the \`help\` command with an ` +
                  'available help topic as a parameter to read additonal help';
              command.reply(help);
          }
          return Promise.resolve();
      }
docs: Reply with help to the command !help
  
  @private
  
  @param {command} command help command
  @returns {Promise} Resolves after help text is generated