Update linter options in Travis. (#213)
Update linter options in Travis. (#213)

Update the Google C++ linter to point to the correct directory after
the directory change a while back. Add the unit test directory as well.
markszabo/IRremoteESP8266,markszabo/IRremoteESP8266,markszabo/IRremoteESP8266,markszabo/IRremoteESP8266