Update README.md

README.md

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-Implementation of `scope_guard` 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 [**P0052R5**][2] (former [N3949][1]).
 
 
 ## Compatibility