[interchange] Update WHATSNEW

commit 3c8141631c773416aa57eaed00510ab1b09b079a
Author: Peter Ajamian <[email protected]>
Date:   Sat Feb 5 20:16:28 2011 +1300

    Update WHATSNEW

 WHATSNEW-5.7 |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/WHATSNEW-5.7 b/WHATSNEW-5.7
index 12dad60..4ce7d27 100644
--- a/WHATSNEW-5.7
+++ b/WHATSNEW-5.7
@@ -26,6 +26,10 @@ Core
   to replace it for when you want to use the table editor in your own custom
   admin pages.
 
+* Strip bad characters from affiliate source.  These characters cause problems
+  in the usertrack log (and possibly other places) if they are allowed to remain
+  in the source.
+
 Tags
 ----
 * Allow sorting of forum entries.