Fixed broken single header following script change

- fixed the script (was missing #ifdefs)
- also fixed single include (Xcode) test project
- build 16

include/internal/catch_version.hpp

@@ -13,7 +13,7 @@
 namespace Catch {
 
     // These numbers are maintained by a script
-    Version libraryVersion( 1, 0, 15, "master" );
+    Version libraryVersion( 1, 0, 16, "master" );
 }
 
 #endif // TWOBLUECUBES_CATCH_VERSION_HPP_INCLUDED