Update to swift 4.2.1, test on 16.04 / 18.04

Kitura / Swift-SMTP

Swift SMTP client

Apache License 2.0

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Update to swift 4.2.1, test on 16.04 / 18.04 #92

Closed djones6 closed 5 years ago

djones6 commented 5 years ago

Minor updates for testing:

Update .swift-version to 4.2.1,
Add Ubuntu 16.04 and 18.04 testing (under Docker),
Make the .travis.yml more consistent with other IBM-Swift repos (comments, indentation).

djones6 commented 5 years ago

Travis is failing because the e-mail credentials (in the form of EMAIL and PASSWORD travis env vars) are not being passed through to the Docker container. Need to think about how we handle this.