Add travis-ci-arduino test script

Author: Ian Katz

.travis.yml

@@ -0,0 +1,24 @@
+language: c
+sudo: false
+cache:
+  directories:
+    - ~/arduino_ide
+    - ~/.arduino15/packages/
+
+git:
+  depth: false
+  quiet: true
+env:
+  global:
+     - ARDUINO_IDE_VERSION="1.8.6"
+before_install:
+  - source <(curl -SLs https://github.com/raw/adafruit/travis-ci-arduino/master/install.sh)
+install:
+  - echo "this is the 'install' section of .travis.yml"
+script:
+  - build_main_platforms
+
+notifications:
+  email:
+    on_success: change
+    on_failure: change