C++: Update change note.

Author: MathiasVP

change-notes/1.26/analysis-cpp.md

@@ -22,5 +22,6 @@ The following changes in version 1.26 affect C/C++ analysis in all applications.
 
 * The models library now models many taint flows through `std::array`, `std::vector`, `std::deque`, `std::list` and `std::forward_list`.
 * The models library now models many more taint flows through `std::string`.
+* The models library now models some taint flows through `std::shared_ptr`, `std::unique_ptr`, `std::make_shared` and `std::make_unique`.
 * The `SimpleRangeAnalysis` library now supports multiplications of the form
   `e1 * e2` and `x *= e2` when `e1` and `e2` are unsigned or constant.