Merge pull request #226 from neonichu/version-yams-dependency

Use Yams 4.0.0 instead of master

Author: artemcm

Package.resolved

@@ -74,7 +74,7 @@ if ProcessInfo.processInfo.environment["SWIFT_DRIVER_LLBUILD_FWK"] == nil {
 if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {
   package.dependencies += [
     .package(url: "https://github.com/apple/swift-tools-support-core.git", .branch("master")),
-    .package(url: "https://github.com/jpsim/Yams.git", .branch("master")),
+    .package(url: "https://github.com/jpsim/Yams.git", .upToNextMinor(from: "4.0.0")),
     ]
 } else {
     package.dependencies += [