Update CHANGELOG.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@62 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/CHANGELOG.txt

@@ -2,6 +2,13 @@ This file contains details of the changes in each new version of PRISM,
 including development and beta versions. For a less detailed overview
 of the main changes in each public release, see the file VERSIONS.txt.
 
+New stuff:
+* multiple reward structures
+ - can be given names too
+ - accessed by R{i}=?[] or R{"name"}=?[ m/c
+ - simulation
+ - export
+
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 Version 3.0 (6/7/2006) (svn rev 55)
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