Broaden SwiftSyntax dependency. (pointfreeco#32)

Author: mbrandonw

Package.resolved

@@ -35,7 +35,7 @@ let package = Package(
     .package(url: "https://github.com/pointfreeco/swift-macro-testing", from: "0.6.0"),
     .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.18.1"),
     .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.5.2"),
-    .package(url: "https://github.com/swiftlang/swift-syntax", "600.0.0"..<"601.0.0"),
+    .package(url: "https://github.com/swiftlang/swift-syntax", "600.0.0"..<"602.0.0"),
   ],
   targets: [
     .target(