Fix ChangeLog entry for 3.20.15

BUG=v8:2845
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/23871002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16476 ce2b1a6d-e550-0410-aec6-3dcde31c8c00