Document the change in the previous commit about loading the config file

When libssl is initialised it will attempt to load any config file. This
ensures any system_default configuration (as per
https://github.com/openssl/openssl/pull/4848) is used.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5818)

CHANGES

diff --git a/CHANGES b/CHANGES
index 40b5823..e5f6cb6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -13,6 +13,9 @@
      in libcrypto when run as setuid/setgid.
      [Bernd Edlinger]
 
+  *) Load any config file by default when libssl is used.
+     [Matt Caswell]
+
   *) Added new public header file <openssl/rand_drbg.h> and documentation
      for the RAND_DRBG API. See manual page RAND_DRBG(7) for an overview.
      [Matthias St. Pierre]