travis: drop gorelease
travis: drop gorelease

replaced with github actions.

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@gmail.com>

a16/gobgp,a16/gobgp,osrg/gobgp,a16/gobgp,osrg/gobgp,j-kato/gobgp,osrg/gobgp,j-kato/gobgp,j-kato/gobgp,fujita/gobgp,osrg/gobgp,a16/gobgp,a16/gobgp,a16/gobgp,fujita/gobgp,fujita/gobgp,a16/gobgp,fujita/gobgp