Adding edit of incoming webhook (#5272)

Adding edit of outgoing webhook
Fixing spelling of error
Fixing style
Changing from PUT to POST for updates
Fixing test failures due to merge

model/client.go

@@ -2008,6 +2008,16 @@ func (c *Client) CreateIncomingWebhook(hook *IncomingWebhook) (*Result, *AppErro
 	}
 }
 
+func (c *Client) UpdateIncomingWebhook(hook *IncomingWebhook) (*Result, *AppError) {
+	if r, err := c.DoApiPost(c.GetTeamRoute()+"/hooks/incoming/update", hook.ToJson()); err != nil {
+		return nil, err
+	} else {
+		defer closeBody(r)
+		return &Result{r.Header.Get(HEADER_REQUEST_ID),
+			r.Header.Get(HEADER_ETAG_SERVER), IncomingWebhookFromJson(r.Body)}, nil
+	}
+}
+
 func (c *Client) PostToWebhook(id, payload string) (*Result, *AppError) {
 	if r, err := c.DoPost("/hooks/"+id, payload, "application/x-www-form-urlencoded"); err != nil {
 		return nil, err
@@ -2099,6 +2109,16 @@ func (c *Client) CreateOutgoingWebhook(hook *OutgoingWebhook) (*Result, *AppErro
 	}
 }
 
+func (c *Client) UpdateOutgoingWebhook(hook *OutgoingWebhook) (*Result, *AppError) {
+	if r, err := c.DoApiPost(c.GetTeamRoute()+"/hooks/outgoing/update", hook.ToJson()); err != nil {
+		return nil, err
+	} else {
+		defer closeBody(r)
+		return &Result{r.Header.Get(HEADER_REQUEST_ID),
+			r.Header.Get(HEADER_ETAG_SERVER), OutgoingWebhookFromJson(r.Body)}, nil
+	}
+}
+
 func (c *Client) DeleteOutgoingWebhook(id string) (*Result, *AppError) {
 	data := make(map[string]string)
 	data["id"] = id