Set SWIFT_VERSION to 2.3 in project settings

Author: johnhammerlund

Nimble.xcodeproj/project.pbxproj

@@ -1465,6 +1465,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 2.3;
 				TARGETED_DEVICE_FAMILY = "1,2,3";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -1505,6 +1506,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				METAL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
+				SWIFT_VERSION = 2.3;
 				TARGETED_DEVICE_FAMILY = "1,2,3";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";