Merge pull request #6 from per1234/fix-esp8266-fqbn

Update ESP8266 FQBN in .travis.yml

Author: jehy

.travis.yml

@@ -2,7 +2,7 @@ language: c
 env:
   global:
   - ARDUINO_VERSION=1.8.4
-  - BD=esp8266:esp8266:d1:CpuFrequency=80,FlashSize=4M3M
+  - BD=esp8266:esp8266:d1:xtal=80,eesz=4M3M
 before_install:
 - "/sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_1.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :1 -ac -screen 0 1280x1024x16"
 - sleep 3