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 b7d4cd6..e7f49d2 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 2.7 that only fixed the build for
+     Completes a previous fix in Mbed TLS 2.7.12 that only fixed the build for
      the example programs. Reported in #1430 and fix contributed by irwir.