Update the README for the 1.2 releases.

svn path=/trunk/theora/; revision=17464

README

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-             The Xiph.org Foundation's libtheora 1.1 
+             The Xiph.org Foundation's libtheora 1.2
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 *** What is Theora?
@@ -12,10 +12,13 @@ while allow it a longer useful lifetime as an competitive codec.
 The 1.0 release decoder supported all the new features, but the
 encoder is nearly identical to the VP3 code.
 
-The 1.1 release features a completely rewritten encoder, offering
+The 1.1 release featured a completely rewritten encoder, offering
 better performance and compression, and making more complete use
-of the format's feature set. Files produced by both encoders can
-be decoded by either release.
+of the format's feature set.
+
+The 1.2 release features significant additional improvements in
+compression and performance. Files produced by newer encoders can
+be decoded by earlier releases.
 
 *** Where is Theora?
 
@@ -41,6 +44,7 @@ Requirements summary:
       as above,
 
       libvorbis and libvorbisenc 1.0.1 or newer.
+      (libvorbis 1.3.1 or newer for 5.1 audio)
 
   For creating a source distribution package:
 
@@ -66,7 +70,7 @@ Windows build support is included in the win32 directory.
 
 Project files for Apple XCode are included in the macosx directory.
 
-There is also an experimental scons build.
+There is also an more limited scons build.
 
 *** How do I use the sample encoder?