Update SwiftPM tag in README
MODIFY
README.md
README.md
@@ -28,7 +28,7 @@ in `Package.swift`:
```swift
dependencies: [
- .package(url: "git@github.com:square/workflow-swift.git", from: "0.21.1")
+ .package(url: "git@github.com:square/workflow-swift.git", from: "0.28.1")
]
```

Update SwiftPM tag in README