Hygiene: Remove .travis.yml
Hygiene: Remove .travis.yml

We are not using Travis CI, so there's no point to keeping this config
file in the repo.

Change-Id: I2f27e19403c2512369cb028f662213636c5ee7c8

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps