Update SwiftPM

1.2.1

Update SwiftPM

Xcode 11 & Swift 5

Update the project to Xcode 11 and Swift 5.

Xcode 9.0 and Swift 4.0

Update project to Xcode 9.0 and Swift 4.0.

Universal Framework

• Fixed update step #3;
• Add Swift Package Manager support;
• Add macOS, watchOS and tvOS support.

Reduce number of steps when moving items

Include optimization from PR #2

Thanks @seaburg.

Fix start index in fourth step

Include fix from PR #1

Thanks @seaburg.