function isShouting(message) {
  return message.replace(/[^A-Z]/g, "").length > message.length / 2 ||
   message.replace(/[^!]/g, "").length >= 3;
}
Detect if the current message is shouting. i.e. there are too many Uppercase
characters or exclamation points.
@param {string} message message to be analyzed
@return {boolean}