docs(changelog): add missing changes to 1.6.4

Author: jovanmaric

CHANGES.md

@@ -1,5 +1,7 @@
 ## 1.6.4
 * Will use POST instead of GET when retrieving result.
+* Suppresses `curl_close` deprecation warning https://www.php.net/manual/en/function.curl-close.php.
+* Support PHP `8.5`.
 
 ## 1.6.3
 * Add minimum TLS 1.2 version to curl options as protocol negotiation on certain openssl/libcurl versions is flaky.