Documentation updated to latest P0052R6 version (fixes #103).

README.md

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-Implementation of *Scope Guards* (`scope_exit`, `scope_success`, `scope_fail`) and `unique_resource` as proposed in [**P0052R5**][2] (former [N3949][1]).
+Implementation of *Scope Guards* (`scope_exit`, `scope_success`, `scope_fail`) and `unique_resource` as proposed in [**P0052R6**][2] (former [N3949][1]).
 
 
 There's a *C++14* implementation on the [**`cpp14`**](https://github.com/offa/scope-guard/tree/cpp14) Branch.
 
 ## Documentation
 
-- [*P0052R5 - Generic Scope Guard and RAII Wrapper for the Standard Library*][2] (P. Sommerlad, A. L. Sandoval, E. Niebler, D. Krügler)
+- [*P0052R6 - Generic Scope Guard and RAII Wrapper for the Standard Library*][2] (P. Sommerlad, A. L. Sandoval, E. Niebler, D. Krügler)
 - [*N3949 - Scoped Resource - Generic RAII Wrapper for the Standard Library*][1] (P. Sommerlad, A. L. Sandoval)
 
 
 
 
 [1]: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3949.pdf
-[2]: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0052r5.pdf
+[2]: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0052r6.pdf