C++: Add change note.

geoffw0 · geoffw0 · commit 40637c18ceb1 · 2021-04-09T18:14:12.000+01:00
diff --git a/cpp/change-notes/2021-04-09-unsigned-difference-expression-compared-zero.md b/cpp/change-notes/2021-04-09-unsigned-difference-expression-compared-zero.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* The 'Unsigned difference expression compared to zero' (cpp/unsigned-difference-expression-compared-zero) query has been improved to produce fewer false positive results.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+lgtm,codescanning`
	`2`	`+* The 'Unsigned difference expression compared to zero' (cpp/unsigned-difference-expression-compared-zero) query has been improved to produce fewer false positive results.`