add: slackevents channel_shared event

slackevents/inner_events.go

@@ -100,6 +100,14 @@ type ChannelIDChangedEvent struct {
 	EventTimestamp string `json:"event_ts"`
 }
 
+// ChannelSharedEvent represents the Channel shared event
+type ChannelSharedEvent struct {
+	Type            string `json:"type"`
+	Channel         string `json:"channel"`
+	EventTimestamp  string `json:"event_ts"`
+	ConnectedTeamID string `json:"connected_team_id"`
+}
+
 // ChannelCreatedInfo represents the information associated with the Channel created event
 type ChannelCreatedInfo struct {
 	ID        string `json:"id"`
@@ -673,6 +681,8 @@ const (
 	AppHomeOpened = EventsAPIType("app_home_opened")
 	// AppUninstalled Your Slack app was uninstalled.
 	AppUninstalled = EventsAPIType("app_uninstalled")
+	// ChannelShared is sent when a channel is shared.
+	ChannelShared = EventsAPIType("channel_shared")
 	// ChannelCreated is sent when a new channel is created.
 	ChannelCreated = EventsAPIType("channel_created")
 	// ChannelDeleted is sent when a channel is deleted.