C++: Add change-note.

MathiasVP · MathiasVP · commit aa5258512048 · 2021-04-13T17:17:05.000+02:00
diff --git a/cpp/change-notes/2021-04-13-arithmetic-queries.md b/cpp/change-notes/2021-04-13-arithmetic-queries.md
@@ -0,0 +1,2 @@
+lgtm
+* The queries cpp/tainted-arithmetic, cpp/uncontrolled-arithmetic, and cpp/arithmetic-with-extreme-values have been improved to produce fewer false positives.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+lgtm`
	`2`	`+* The queries cpp/tainted-arithmetic, cpp/uncontrolled-arithmetic, and cpp/arithmetic-with-extreme-values have been improved to produce fewer false positives.`