Swift4.2

[vkaramov]

Swift 4.2 support

[ghost]

Hi @vkaramov thanks a lot for contributing, this is really valuable to us.
Errors are due to CI using Xcode 9 and previous version of swift. We have plans to migrate to Xcode 10 and 4.2 across all our modules in ~ month time before the end of the year. Until that time we'd like to avoid exceptions in both code and stack configuration.
Please stay tuned and again, thanks a lot for your PR!

[vkolosovsky]

@albertodebortoli Do you have plans to release 4.2 support in the mean time?

[ghost]

Hi @vkolosovsky, we just did for you!

This PR included two changes: 1. support for swift 4.2 and 2. attempt to fix a bug that was already sorted (in a differ way) with #23.

We created #24 with the 2 commits from this PR plus other minor details and published version 4.1.0 to the master repo. Closing this one.

Thanks @vkaramov for contributing!