ci: fix .travis.yml syntax for conditional deployments
ci: fix .travis.yml syntax for conditional deployments

Was scilently missing `on:` section :(

https://docs.travis-ci.com/user/deployment/#conditional-releases-with-on

Signed-off-by: Alexander Bezzubov <32a1657a86d71c097f6d3221860d4ad6730d748a@apache.org>

go-enry/go-enry,go-enry/go-enry,go-enry/go-enry,go-enry/go-enry,go-enry/go-enry,go-enry/go-enry,go-enry/go-enry