Deduction guide for the reference wrapper removed (fixes #98).

include/unique_resource.h

     template<class R, class D>
     unique_resource(R&& r, D&& d) -> unique_resource<std::decay_t<R>, std::decay_t<D>>;
 
-    template<class R, class D>
-    unique_resource(std::reference_wrapper<R> r, D&& d) -> unique_resource<R&, std::decay_t<D>>;
-
 
     template<class R, class D, class S = R>
     unique_resource<std::decay_t<R>, std::decay_t<D>> make_unique_resource_checked(R&& r, const S& invalid, D&& d)