pre-install arduino in travis

Author: ianfixes

.travis.yml

@@ -8,7 +8,11 @@ language: ruby
 #  - rbx
 #  - "2.5.0"
 
-before_install: gem install bundler -v 1.15.4
+before_install:
+  - gem install bundler -v 1.15.4
+  - apt-get update
+  - apt-get arduino
+
 script:
    - bundle exec rubocop --version
    - bundle exec rubocop -D .