Update all `secret: ` values in `.travis.yml`

[Sviatoslav Sydorenko (Святослав Сидоренко)]

Do like this:

REPO_NAME={{ YOUR_REPO_NAME }}
travis encrypt -r "aio-libs/${REPO_NAME}" --api-endpoint 'https://api.travis-ci.com/'

Ref: https://github.com/orgs/aio-libs/teams/admins/discussions/9

[Sviatoslav Sydorenko (Святослав Сидоренко)]

user: aio-libs-bot

secure: "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"

[Sam Bull]

Migrated to Github now.