v1.3.0 to match new ESP8266 core v3.0.0

### Releases v1.3.0

1. Update to match new ESP8266 core v3.0.0

Author: khoih-prog

README.md

@@ -17,6 +17,7 @@
   * [Currently supported Boards](#currently-supported-boards)
   * [Important Notes about ISR](#important-notes-about-isr)
 * [Changelog](#changelog)
+  * [Releases v1.3.0](#releases-v130)
   * [Releases v1.2.0](#releases-v120)
   * [Releases v1.1.1](#releases-v111)
   * [Releases v1.1.0](#releases-v110)