message: elle.Clonable: clean up
diff: @@ -21,6 +21,5 @@ namespace elle
  std::unique_ptr<typename Self::_elle_Cloned> \
  clone() const override \
  { \
  - return \
  - std::unique_ptr<typename Self::_elle_Cloned>(new Self(*this)); \
  + return std::make_unique<Self>(*this); \
  }
  