Update Package.swift

Update to be compatible with SwiftTransformers until this PR is merged

huggingface/swift-transformers#179

Author: matiasvillaverde

Package.swift

@@ -22,7 +22,7 @@ let package = Package(
             targets: ["SentencepieceTokenizer"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.5.0")
+        .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.4.0")
     ],
     targets: [
         .executableTarget(