code: function(access_token, title, text, type, importance, expires_at) {
  		if (!expires_at) return Promise.reject(new Error('wotblitz.clanmessages.create: all arguments are required'));
  
  		return request({
  			hostname: hosts.wotb,
  			path: '/wotb/clanmessages/create/'
  		}, {
  			access_token: access_token,
  			expires_at: expires_at,
  			importance: importance,
  			text: text,
  			title: title,
  			type: type
  		});
  	}
docs: Post a new message.
  
  @param {string} access_token user's authentication string
  @param {string} title message topic
  @param {string} text message body
  @param {string} type message category, values "general", "training", "meeting", or "battle"
  @param {string} importance values "important" or "standard"
  @param {string} expires_at invalidation date
  @returns {Promise<Object>} resolves to the `message_id`