ChangeLog: Acknowledge 2.0.3/de-acknowledge 2.0.4

It is very unlikely that there will be an official 2.0.4 release.

ChangeLog.md

@@ -1,7 +1,7 @@
 2.1 pre-beta
 ============
 
-### Significant changes relative to 2.0.1:
+### Significant changes relative to 2.0.3:
 
 1. The build system, x86-64 SIMD extensions, and accelerated Huffman codec now
 support the x32 ABI on Linux, which allows for using x86-64 instructions with
@@ -45,14 +45,19 @@ longer supports 32-bit Java virtual machines.  Oracle no longer provides a
 32-bit JVM for macOS, and Apple's implementation of Java 1.6 (Java for OS X
 systems) is long obsolete.
 
-5. The SSE2 (x86 SIMD) and C Huffman encoding algorithms have been
+5. Fixed a regression in the Windows packaging system (introduced by
+2.0 beta1[2]) whereby, if both the 64-bit libjpeg-turbo SDK for GCC and the
+64-bit libjpeg-turbo SDK for Visual C++ were installed on the same system, only
+one of them could be uninstalled.
+
+6. The SSE2 (x86 SIMD) and C Huffman encoding algorithms have been
 significantly optimized, resulting in a measured average overall compression
 speedup of 12-28% for 64-bit code and 22-52% for 32-bit code on various Intel
 and AMD CPUs, as well as a measured average overall compression speedup of
 0-23% on platforms that do not have a SIMD-accelerated Huffman encoding
 implementation.
 
-6. The block smoothing algorithm that the libjpeg API library optionally
+7. The block smoothing algorithm that the libjpeg API library optionally
 applies when decompressing multi-scan images is now more fault-tolerant.
 Previously, if a particular scan was incomplete, then the smoothing parameters
 for the incomplete scan would be applied to the entire output image, including
@@ -64,17 +69,6 @@ which scan generated the pixels in that row, rather than always using the block
 smoothing parameters for the most recent scan.
 
 
-2.0.4
-=====
-
-### Significant changes relative to 2.0.3:
-
-1. Fixed a regression in the Windows packaging system (introduced by
-2.0 beta1[2]) whereby, if both the 64-bit libjpeg-turbo SDK for GCC and the
-64-bit libjpeg-turbo SDK for Visual C++ were installed on the same system, only
-one of them could be uninstalled.
-
-
 2.0.3
 =====