Upgrade to swift 4.1#49

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cheskapac wants to merge 3 commits intoWorldDownTown:masterfrom

cheskapac:master

Commits on Jul 16, 2018

Upgrade to swift 4.1
cheskapac
committed

Commits on Jul 27, 2018

Specify swift version
cheskapac
committed

Commits on Apr 6, 2019

Upgrade to Swift 4.2
cheskapac
committed