Added NEWS and UPGRADING info for phpdbg

Author: bwoebi

NEWS

@@ -67,6 +67,10 @@ PHP                                                                        NEWS
   . Fixed Bug #63657 (pgsqlCopyFromFile, pgsqlCopyToArray use Postgres < 7.3
     syntax). (Matteo)
 
+- phpdbg:
+  . Included phpdbg sapi (RFC: https://wiki.php.net/rfc/phpdbg).
+    (Felipe Pena, Joe Watkins and Bob Weinand)
+
 - Session:
   . Fixed Bug #65315 (session.hash_function silently fallback to default md5)
     (Yasuo)

UPGRADING

@@ -62,6 +62,8 @@ PHP X.Y UPGRADE NOTES
 2. Changes in SAPI modules
 ========================================
 
+- Added phpdbg sapi.
+  (https://wiki.php.net/rfc/phpdbg)
 
 ========================================
 3. Deprecated Functionality