Fix travis builds based on latest core

README.md

@@ -3,10 +3,10 @@
 ESPurna ("spark" in Catalan) is a custom firmware for ESP8285/ESP8266 based smart switches, lights and sensors.
 It uses the Arduino Core for ESP8266 framework and a number of 3rd party libraries.
 
-[![version](https://img.shields.io/badge/version-1.13.4-brightgreen.svg)](CHANGELOG.md)
-[![branch](https://img.shields.io/badge/branch-alexa-orange.svg)](https://github.com/xoseperez/espurna/tree/alexa/)
+[![version](https://img.shields.io/badge/version-1.13.4-dev-brightgreen.svg)](CHANGELOG.md)
+[![branch](https://img.shields.io/badge/branch-dev-orange.svg)](https://github.com/xoseperez/espurna/tree/dev/)
 [![license](https://img.shields.io/github/license/xoseperez/espurna.svg)](LICENSE)
-[![travis](https://travis-ci.org/xoseperez/espurna.svg?branch=alexa)](https://travis-ci.org/xoseperez/espurna)
+[![travis](https://travis-ci.org/xoseperez/espurna.svg?branch=dev)](https://travis-ci.org/xoseperez/espurna)
 [![codacy](https://api.codacy.com/project/badge/Grade/c9496e25cf07434cba786b462cb15f49)](https://www.codacy.com/app/xoseperez/espurna/dashboard)
 [![downloads](https://img.shields.io/github/downloads/xoseperez/espurna/total.svg)](https://github.com/xoseperez/espurna/releases)
 <br />

code/platformio.ini

@@ -20,6 +20,7 @@ arduino_core_2_4_1 = espressif8266@1.7.3
 arduino_core_2_4_2 = espressif8266@1.8.0
 
 platform = ${common.arduino_core_2_3_0}
+platform_latest = ${common.arduino_core_2_4_2}
 
 # ------------------------------------------------------------------------------
 # FLAGS: DEBUG