Fix compilation error on watchos

Author: malcommac

SwiftRichString.xcodeproj/project.pbxproj

@@ -1990,7 +1990,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				TARGETED_DEVICE_FAMILY = 4;
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
+				WATCHOS_DEPLOYMENT_TARGET = 4.3;
 			};
 			name = Debug;
 		};
@@ -2017,7 +2017,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				TARGETED_DEVICE_FAMILY = 4;
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
+				WATCHOS_DEPLOYMENT_TARGET = 4.3;
 			};
 			name = Release;
 		};