Clara ignores anything after a lone — (double dash)

- this allows use within an environment that appends additional arguments that Clara will otherwise reject
- generated build 23

include/internal/catch_version.hpp

@@ -13,7 +13,7 @@
 namespace Catch {
 
     // These numbers are maintained by a script
-    Version libraryVersion( 1, 0, 22, "master" );
+    Version libraryVersion( 1, 0, 23, "master" );
 }
 
 #endif // TWOBLUECUBES_CATCH_VERSION_HPP_INCLUDED