Add missing `CURRENT_PROJECT_VESION` to xcodeproj

Fix #28

Base32.xcodeproj/project.pbxproj

@@ -364,6 +364,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = __PBXFileRef_Base32.xcodeproj/Configs/Project.xcconfig /* Base32.xcodeproj/Configs/Project.xcconfig */;
 			buildSettings = {
+				CURRENT_PROJECT_VERSION = 1.0;
 				ENABLE_TESTABILITY = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 			};
@@ -373,6 +374,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = __PBXFileRef_Base32.xcodeproj/Configs/Project.xcconfig /* Base32.xcodeproj/Configs/Project.xcconfig */;
 			buildSettings = {
+				CURRENT_PROJECT_VERSION = 1.0;
 				ENABLE_TESTABILITY = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";