Update to Swift 4.2

Author: Tom Kemp

PusherSwift.xcodeproj/project.pbxproj

@@ -246,11 +246,11 @@
 				TargetAttributes = {
 					33831C881A9CF61600B124F1 = {
 						CreatedOnToolsVersion = 6.3;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 1010;
 					};
 					33831C931A9CF61600B124F1 = {
 						CreatedOnToolsVersion = 6.3;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 1010;
 					};
 				};
 			};
@@ -498,7 +498,7 @@
 				SKIP_INSTALL = YES;
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx appletvsimulator appletvos";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2,3,4";
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -555,7 +555,7 @@
 				SDKROOT = "";
 				SKIP_INSTALL = YES;
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx appletvsimulator appletvos";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2,3,4";
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
@@ -613,7 +613,7 @@
 				SDKROOT = "";
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx appletvsimulator appletvos";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Debug;
@@ -659,7 +659,7 @@
 				PRODUCT_NAME = PusherSwiftTests;
 				SDKROOT = "";
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx appletvsimulator appletvos";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
 			};