Merge pull request #6 from gwinn/master

update fields for webhook

v1/types.go

@@ -105,8 +105,8 @@ type WebhookRequest struct {
 type WebhookData struct {
 	ExternalUserID         string `json:"external_user_id"`
 	ExternalMessageID      string `json:"external_message_id,omitempty"`
+	ExternalChatID         int64  `json:"external_chat_id"`
 	ChannelID              uint64 `json:"channel_id"`
-	ChatID                 int64  `json:"chat_id"` // TODO: add to webhook request
 	Content                string `json:"content"`
 	QuoteMessageExternalID string `json:"quote_message_external_id,omitempty"`
 }