enable full backtrace

Author: ianfixes

.travis.yml

@@ -23,7 +23,7 @@ script:
    - bundle install
    - bundle exec rubocop --version
    - bundle exec rubocop -D .
-   - bundle exec rspec
+   - bundle exec rspec --backtrace
    - cd SampleProjects/TestSomething
    - bundle install
    - bundle exec arduino_ci_remote.rb

appveyor.yml

@@ -21,7 +21,7 @@ test_script:
   - ps: $ProgressPreference = "SilentlyContinue"
   - bundle exec rubocop --version
   - bundle exec rubocop -D .
-  - bundle exec rspec
+  - bundle exec rspec --backtrace
   - cd SampleProjects\TestSomething
   - bundle install
   - bundle exec arduino_ci_remote.rb