Update dependencies (#886)

vendor/github.com/nlopes/slack/webhooks.go

@@ -9,26 +9,32 @@ import (
 )
 
 type WebhookMessage struct {
-	Text        string       `json:"text,omitempty"`
-	Attachments []Attachment `json:"attachments,omitempty"`
+	Username        string       `json:"username,omitempty"`
+	IconEmoji       string       `json:"icon_emoji,omitempty"`
+	IconURL         string       `json:"icon_url,omitempty"`
+	Channel         string       `json:"channel,omitempty"`
+	ThreadTimestamp string       `json:"thread_ts,omitempty"`
+	Text            string       `json:"text,omitempty"`
+	Attachments     []Attachment `json:"attachments,omitempty"`
+	Parse           string       `json:"parse,omitempty"`
 }
 
 func PostWebhook(url string, msg *WebhookMessage) error {
+	return PostWebhookCustomHTTP(url, http.DefaultClient, msg)
+}
+
+func PostWebhookCustomHTTP(url string, httpClient *http.Client, msg *WebhookMessage) error {
 	raw, err := json.Marshal(msg)
 
 	if err != nil {
 		return errors.Wrap(err, "marshal failed")
 	}
 
-	response, err := http.Post(url, "application/json", bytes.NewReader(raw))
+	response, err := httpClient.Post(url, "application/json", bytes.NewReader(raw))
 
 	if err != nil {
 		return errors.Wrap(err, "failed to post webhook")
 	}
 
-	if response.StatusCode != http.StatusOK {
-		return statusCodeError{Code: response.StatusCode, Status: response.Status}
-	}
-
-	return nil
+	return checkStatusCode(response, discard{})
 }