eject fails to build with Xcode 11 (swift 3 is unsupported)

[fxcoudert]

==> xcodebuild SYMROOT=build
Build settings from command line:
    SYMROOT = build

note: Using new build system
note: Planning build
note: Constructing build description
error: SWIFT_VERSION '3.0' is unsupported, supported versions are: 4.0, 4.2, 5.0. (in target 'eject' from project 'Eject')
error: SWIFT_VERSION '3.0' is unsupported, supported versions are: 4.0, 4.2, 5.0. (in target 'EjectKit' from project 'Eject')