Fix an LTS version number in a changelog entry

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/bugfix.txt b/ChangeLog.d/bugfix.txt
index 875d488..d7ace30 100644
--- a/ChangeLog.d/bugfix.txt
+++ b/ChangeLog.d/bugfix.txt
@@ -1,4 +1,4 @@
 Bugfix
    * Fix the Visual Studio Release x64 build configuration for mbedtls itself.
-     Completes a previous fix in Mbed TLS 2.16 that only fixed the build for
+     Completes a previous fix in Mbed TLS 2.16.3 that only fixed the build for
      the example programs. Reported in #1430 and fix contributed by irwir.