C++: Change note.

cpp/change-notes/2021-07-13-cleartext-storage-file.md

@@ -0,0 +1,3 @@
+lgtm,codescanning
+* The "Cleartext storage of sensitive information in file" (cpp/cleartext-storage-file) query now uses dataflow to produce additional results.
+* Heuristics in the SensitiveExprs.qll library have been improved, making the "Cleartext storage of sensitive information in file" (cpp/cleartext-storage-file), "Cleartext storage of sensitive information in buffer" (cpp/cleartext-storage-buffer) and "Cleartext storage of sensitive information in an SQLite" (cpp/cleartext-storage-database) queries more accurate.