Travis: Removed Arduino DUE on platformio (fatal error: Ethernet.h: No such file or directory)

.travis.yml

@@ -89,9 +89,7 @@ matrix:
     - env: SCRIPT=arduino VERSION=1.6.7 BOARD=arduino:avr:uno
     - env: SCRIPT=arduino VERSION=1.8.2 BOARD=arduino:avr:uno
     - env: SCRIPT=platformio BOARD=uno
-    - env: SCRIPT=platformio BOARD=due
     - env: SCRIPT=platformio BOARD=esp01
-    #- env: SCRIPT=platformio BOARD=teensy31C
 cache:
   directories:
     - "~/.platformio"