Enable Swift 4

CryptoSwift.xcodeproj/project.pbxproj

@@ -716,7 +716,7 @@
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx appletvos watchos appletvsimulator watchsimulator";
 				SWIFT_INSTALL_OBJC_HEADER = NO;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2,3,4";
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -771,7 +771,7 @@
 				PRODUCT_NAME = CryptoSwift;
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx appletvos watchos appletvsimulator watchsimulator";
 				SWIFT_INSTALL_OBJC_HEADER = NO;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2,3,4";
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
@@ -798,7 +798,6 @@
 				PRODUCT_NAME = CryptoSwift;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -826,7 +825,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_DISABLE_SAFETY_CHECKS = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -852,7 +850,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.hakore.${PRODUCT_NAME:rfc1034identifier}";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = Tests/CryptoSwiftTests/Bridging.h;
-				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -876,7 +873,6 @@
 				SWIFT_DISABLE_SAFETY_CHECKS = YES;
 				SWIFT_OBJC_BRIDGING_HEADER = Tests/CryptoSwiftTests/Bridging.h;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};