[devel] Update CHANGES and ANNOUNCE

ANNOUNCE

@@ -149,8 +149,6 @@ version 1.5.0beta17 [April 17, 2010]
     the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
     PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
   Added some "(long)" typecasts to printf calls in png_handle_cHRM().
-
-version 1.5.0freeze01 [April 17, 2010]
   Freeze build-time only configuration in the build.
     In all prior versions of libpng most configuration options
     controlled by compiler #defines had to be repeated by the

CHANGES

@@ -2622,7 +2622,7 @@ version 1.5.0beta16 [April 1, 2010]
   Combined multiple png_warning() calls for a single error.
   Restored the macro definition of png_check_sig().
 
-version 1.5.0beta17 [April 16, 2010]
+version 1.5.0beta17 [April 17, 2010]
   Added some "(long)" typecasts to printf calls in png_handle_cHRM().
   Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
   Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect