Resolve compilation warnings with Swift 5 and later

Kitura / Swift-SMTP

Swift SMTP client

Apache License 2.0

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Closed djones6 closed 5 years ago

djones6 commented 5 years ago

Updates the CI to test Swift 5.1 release build and docker image
Resolves compilation warnings relating to index(of:) being renamed firstIndex(of:) in Swift 5
Resolves compilation warnings relating to implicit matching of cases as tuples in future versions of Swift