Travis-CI build stages

[bkimminich]

Introduce https://docs.travis-ci.com/user/build-stages

• end-to-end tests should run only if npm test has passed for all supported node.js versions
• deployment should still only trigger for one chosen node.js version if unit/int tests and e2e tests have passed

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[yindia]

@bkimminich it run for 6 & 8 . Check .travis.yml
`node_js:

• 6 # recommended version
• 8`

[stale]

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[bkimminich]

With the &&-concatenated script this has become kind of unnecessary.

[lock]

This thread has been automatically locked because it has not had recent activity after it was closed. 🔒 Please open a new issue for regressions or related bugs.