Update to latest Xcode

Author: Tricertops

Block Key-Value Observing.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 53;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -317,7 +317,7 @@
 				BuildIndependentTargetsInParallel = YES;
 				CLASSPREFIX = MTK;
 				LastTestingUpgradeCheck = 0510;
-				LastUpgradeCheck = 1430;
+				LastUpgradeCheck = 1520;
 				ORGANIZATIONNAME = "Martin Kiss";
 				TargetAttributes = {
 					5B18EAB616B2F47A00362576 = {
@@ -533,6 +533,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
@@ -573,6 +574,7 @@
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;