Add upgrading entries

[ci skip]

Author: nikic

NEWS

@@ -27,6 +27,8 @@ PHP                                                                        NEWS
 
 - Standard:
   . Fixed bug #78282 (atime and mtime mismatch). (cmb)
+  . Fixed bug #73535 (php_sockop_write() returns 0 on error, can be used to
+    trigger Denial of Service). (Nikita)
 
 11 Jul 2019, PHP 7.4.0alpha3
 

UPGRADING

@@ -139,6 +139,9 @@ PHP 7.4 UPGRADE NOTES
     warning) if it is used with an encoding for which only basic entity
     substitution is supported, in which case it is equivalent to
     htmlspecialchars().
+  . fread() and fwrite() will now return false if the operation failed.
+    Previously an empty string or 0 was returned. EAGAIN/EWOULDBLOCK are not
+    considered failures.
 
 - Tokenizer:
   . token_get_all() will now emit a T_BAD_CHARACTER token for unexpected

UPGRADING.INTERNALS

@@ -25,6 +25,7 @@ PHP 7.4 INTERNALS UPGRADE NOTES
   v. Compound assignment opcodes
   w. APACHE symbol removed
   x. php_error_docref0() renamed to php_error_docref()
+  y. Stream wrapper read/write ops
 
 2. Build system changes
   a. Abstract
@@ -225,6 +226,9 @@ PHP 7.4 INTERNALS UPGRADE NOTES
 
   x. php_error_docref0() has been removed and renamed to php_error_docref().
 
+  y. The read and write operations of php_stream_ops now return ssize_t, with
+     negative values indicating an error.
+
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 2. Build system changes
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