Use Swift 5.0 branch

Package.resolved

@@ -1,13 +1,22 @@
 {
   "object": {
     "pins": [
+      {
+        "package": "llbuild",
+        "repositoryURL": "https://github.com/apple/swift-llbuild.git",
+        "state": {
+          "branch": "master",
+          "revision": "d603a1641614065415d92af008fc60c1f1ea07ed",
+          "version": null
+        }
+      },
       {
         "package": "SwiftPM",
         "repositoryURL": "https://github.com/apple/swift-package-manager.git",
         "state": {
-          "branch": null,
-          "revision": "235aacc514cb81a6881364b0fedcb3dd083228f3",
-          "version": "0.3.0"
+          "branch": "swift-5.0-branch",
+          "revision": "3a57975e10be0b1a8b87992ddf3a49701036f96c",
+          "version": null
         }
       }
     ]

Package.swift

@@ -11,7 +11,8 @@ let package = Package(
        )
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-package-manager.git", from: "0.3.0")
+        // There is no tagged release of Swift 5's SwiftPM yet, so let's use this for now.
+        .package(url: "https://github.com/apple/swift-package-manager.git", .branch("swift-5.0-branch"))
     ],
     targets: [
         .target(
@@ -27,7 +28,7 @@ let package = Package(
         .target(
             name: "XcodeSimulatorKit",
             dependencies: [
-                "Utility"
+                "SPMUtility"
             ]
         ),