Wrap our Travis commands with travis_retry, to mitigate network timeouts
If we see a lot of timeouts, we should start putting travis_retry before all our network commands: https://docs.travis-ci.com/user/common-build-problems/#travis_retry
If we see a lot of timeouts, we should start putting travis_retry before all our network commands: https://docs.travis-ci.com/user/common-build-problems/#travis_retry