Set swift version to 3.0

Author: davidask

Futures.xcodeproj/project.pbxproj

@@ -689,7 +689,6 @@
 				PRODUCT_NAME = Futures;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -716,7 +715,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.formbound.Futures;
 				PRODUCT_NAME = Futures;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;