Fix attribute parsing

[avsej]

Hi guys

There is a mistype of rb_define_attr signature in regex which cause that real attribute definitions cannot be parsed. Your specs used wrong signatures, therefore all was green. This is the real signature for rb_define_attr(). There is only four arguments.

void rb_define_attr(VALUE klass, const char *name, int read, int write)

Thanks

[lsegal]

Thank you for fixing this. It's unfortunate that we messed this up!