CPP: Change note.

Author: geoffw0

change-notes/1.21/analysis-cpp.md

@@ -18,6 +18,7 @@
 | Memory is never freed (`cpp/memory-never-freed`) | More correct results | Support added for more Microsoft-specific allocation functions, including `LocalAlloc`, `GlobalAlloc`, `HeapAlloc` and `CoTaskMemAlloc`. |
 | Resource not released in destructor (`cpp/resource-not-released-in-destructor`) | Fewer false positive results | Resource allocation and deallocation functions are now determined more accurately. |
 | Comparison result is always the same | Fewer false positive results | The range analysis library is now more conservative about floating point values being possibly `NaN` |
+| Use of potentially dangerous function | More correct results | Calls to `localtime`, `ctime` and `asctime` are now detected by this query. |
 | Wrong type of arguments to formatting function (`cpp/wrong-type-format-argument`) | More correct results and fewer false positive results | This query now more accurately identifies wide and non-wide string/character format arguments on different platforms.  Platform detection has also been made more accurate for the purposes of this query. |
 | Wrong type of arguments to formatting function (`cpp/wrong-type-format-argument`) | Fewer false positive results | Non-standard uses of %L are now understood. |