Merge pull request #6 from CuriositySoftware/swift_syntax_version

SwiftSyntax version specification changed to upToNextMajor

Author: yimajo

Package.swift

@@ -17,7 +17,7 @@ let package = Package(
         ),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-syntax.git", from: "509.0.2"),
+        .package(url: "https://github.com/apple/swift-syntax.git", .upToNextMajor(from: "509.0.2")),
     ],
     targets: [
         .macro(