Updated the Unit Tests target to Xcode 4

Author: lukaskollmer

RuntimeKit.xcodeproj/project.pbxproj

@@ -284,7 +284,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = me.kollmer.RuntimeKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -298,7 +298,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = me.kollmer.RuntimeKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};