message: should use value not payload as keyname
diff: @@ -267,7 +267,7 @@ function TeamsBot(configuration) {
  this.content.text = v;
  return this;
  },
  - button: function(type, title, payload) {
  + button: function(type, title, value) {
  if (!this.content.buttons) {
  this.content.buttons = [];
  }
  @@ -275,7 +275,7 @@ function TeamsBot(configuration) {
  var button_obj = (typeof(type) === 'object') ? type : {
  type: type,
  title: title,
  - payload: payload,
  + value: value,
  };
  this.content.buttons.push(button_obj);
  