Removed `fast_finish: true` from Travis CI configuration
Removed `fast_finish: true` from Travis CI configuration

no issue

Based on reported upstream issues - https://github.com/travis-ci/travis-ci/issues/1696
We started receiving multiple notifications per build from Travis after enabling `allowed_failures` for node 12. It seems `allowed_failures` along with `fast_finish` don't work well in travis ci config, and sends a notification first for when main jobs are finished, and then for each `allowed_failure` job.  It doesn't seem like the issue is fixed upstream based on above, so disabling `fast_finish` for now.

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