Add ChangeLog entry for #3147: MSVC flags

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog.d/align-msvc-flags.txt b/ChangeLog.d/align-msvc-flags.txt
new file mode 100644
index 0000000..02de3fd
--- /dev/null
+++ b/ChangeLog.d/align-msvc-flags.txt
@@ -0,0 +1,3 @@
+Changes
+   *  Align MSVC error flag with GCC and Clang. Contributed by Carlos Gomes
+      Martinho. #3147