Updated to Swift 5

GCDWebServer.xcodeproj/project.pbxproj

@@ -1176,7 +1176,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "net.pol-online.GCDWebServers";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				WARNING_CFLAGS = (
 					"-Wall",
 					"-Weverything",
@@ -1215,7 +1215,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "net.pol-online.GCDWebServers";
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_TREAT_WARNINGS_AS_ERRORS = YES;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				WARNING_CFLAGS = "-Wall";
 			};
 			name = Release;