Wrap line to 79 columns

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/fix-gcc-format-signedness-warnings.txt b/ChangeLog.d/fix-gcc-format-signedness-warnings.txt
index 023d15c..2d22b94 100644
--- a/ChangeLog.d/fix-gcc-format-signedness-warnings.txt
+++ b/ChangeLog.d/fix-gcc-format-signedness-warnings.txt
@@ -1,3 +1,4 @@
 Changes
    * Fix warnings about signedness issues in format strings. The build is now
-     clean of -Wformat-signedness warnings. Contributed by Kenneth Soerensen in #3153.
+     clean of -Wformat-signedness warnings. Contributed by Kenneth Soerensen
+     in #3153.