Add entries for new Sodium functions to NEWS

Author: ramsey

NEWS

@@ -102,6 +102,11 @@ PHP                                                                        NEWS
   . Convert resource<pspell> to object \PSpell. (Sara)
   . Convert resource<pspell config> to object \PSpellConfig. (Sara)
 
+- Sodium:
+  . Added the XChaCha20 stream cipher functions. (P.I.E. Security Team)
+  . Added the Ristretto255 functions, which are available in libsodium 1.0.18.
+    (P.I.E. Security Team)
+
 - SPL:
   . Fixed bug #80724 (FilesystemIterator::FOLLOW_SYMLINKS remove KEY_AS_FILE
     from bitmask). (Cameron Porter)