We no longer credit contributors in the changelog

From now on, external contributions are no longer acknowledged in the
changelog file. They of course remain acknowledged in the Git history.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/00README.md b/ChangeLog.d/00README.md
index b559e23..abe0537 100644
--- a/ChangeLog.d/00README.md
+++ b/ChangeLog.d/00README.md
@@ -49,8 +49,7 @@
 Mbed TLS issue. Add other external references such as CVE numbers where
 applicable.
 
-Credit the author of the contribution if the contribution is not a member of
-the Mbed TLS development team. Also credit bug reporters where applicable.
+Credit bug reporters where applicable.
 
 **Explain why, not how**. Remember that the audience is the users of the
 library, not its developers. In particular, for a bug fix, explain the