Update README.md (#805)

Update swift-syntax repository link in README.md

Author: lamtrinhdev

README.md

@@ -41,7 +41,7 @@ Foundation builds in different configurations and is composed of several project
 
 A shared library shipped in the Swift toolchain, written in Swift. It provides the core implementation of many key types, including `URL`, `Data`, `JSONDecoder`, `Locale`, `Calendar`, and more in the `FoundationEssentials` and `FoundationInternationalization` modules. Its source code is shared across all platforms.
 
-_swift-foundation_ depends on a limited set of packages, primarily [swift-collections](http://github.com/apple/swift-collections) and [swift-syntax](http://github.com/apple/swift-syntax).
+_swift-foundation_ depends on a limited set of packages, primarily [swift-collections](http://github.com/apple/swift-collections) and [swift-syntax](http://github.com/swiftlang/swift-syntax).
 
 ### Swift Corelibs Foundation