Add keep alive to Travis deploy
Add keep alive to Travis deploy

Some deploys take over 10 minutes and Travis kills the job. This
workaround is from https://github.com/travis-ci/dpl/issues/568

adafruit/circuitpython,adafruit/micropython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/micropython