Xcode9: added todo to remove swift(>=4) check to remind us once we migrated
Xcode9: added todo to remove swift(>=4) check to remind us once we migrated

net-a-porter-mobile/XCTest-Gherkin,net-a-porter-mobile/XCTest-Gherkin,net-a-porter-mobile/XCTest-Gherkin,net-a-porter-mobile/XCTest-Gherkin