Fixing the Travis CI config

A1 is not available on ESP8266 so just remove the test for it.

Author: Uli

.travis.yml

@@ -16,4 +16,4 @@ install:
     - pip install -U platformio
 
 script:
-    - platformio ci --board=esp12e --board=megaatmega2560 --lib="."
+    - platformio ci --board=megaatmega2560 --lib="."