[libpng14] Bump version to 1.4.13beta04

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.4.13beta03 - June 18, 2013
+Libpng 1.4.13beta04 - June 18, 2013
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,20 +9,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.4.13beta03.tar.xz (LZMA-compressed, recommended)
-   1.4.13beta03.tar.gz
-   1.4.13beta03.tar.bz2
+   1.4.13beta04.tar.xz (LZMA-compressed, recommended)
+   1.4.13beta04.tar.gz
+   1.4.13beta04.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1413b03.7z (LZMA-compressed, recommended)
-   lp1413b03.zip
+   lp1413b04.7z (LZMA-compressed, recommended)
+   lp1413b04.zip
 
 Other information:
 
-   1.4.13beta03-README.txt
-   1.4.13beta03-LICENSE.txt
+   1.4.13beta04-README.txt
+   1.4.13beta04-LICENSE.txt
 
 Changes since the last public release (1.4.11):
 
@@ -46,6 +46,8 @@ version 1.4.13beta03 [June 18, 2013]
   Avoid a possible memory leak in contrib/gregbook/readpng.c
   Removed a redundant test from png_set_IHDR().
 
+version 1.4.13beta04 [June 18, 2013]
+
 Send comments/corrections/commendations to glennrp at users.sourceforge.net
 or to png-mng-implement at lists.sf.net (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement).