[bisq-network/bisq] Remove Slack notification in travis build config (#4459)

[Florian Reimair]

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While I played around with the travis config in order to get a test coverage report, I noticed that there still is some configuration for Slack. We have not used Slack for quite some time now so I figured it is time to remove that remnant of old times as well.

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4459

-- Commit Summary --

  * Remove Slack notification in travis build

-- File Changes --

    M .travis.yml (7)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4459.patch
https://github.com/bisq-network/bisq/pull/4459.diff

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