Adjust Update Library license

Author: SuGlider

libraries/Update/src/HttpsOTAUpdate.h

@@ -1,3 +1,9 @@
+/* OTA task
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
 #ifndef HTTPSOTAUPDATE_H
 #define HTTPSOTAUPDATE_H
 #include "esp_http_client.h"