Add a note in CHANGES

[extended tests]
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2688)

CHANGES

@@ -9,6 +9,12 @@
 
  Changes between 1.1.0g and 1.1.1 [xx XXX xxxx]
 
+  *) Extend OSSL_STORE with capabilities to search and to narrow the set of
+     objects loaded.  This adds the functions OSSL_STORE_expect() and
+     OSSL_STORE_find() as well as needed tools to construct searches and
+     get the search data out of them.
+     [Richard Levitte]
+
   *) Support for TLSv1.3 added. Note that users upgrading from an earlier
      version of OpenSSL should review their configuration settings to ensure
      that they are still appropriate for TLSv1.3. In particular if no TLSv1.3