[PATCHv2][wwwdocs] Mention -freport-bug in release notes

[Yury Gribov]

 > On 01/16/2015 12:18 PM, Yury Gribov wrote:
>This is a wwwdocs patch to changes.html to announce -freport-bug flag.
>
> Ok to commit?

Hi all,

Second version of patch with updates from Gerald Pfeifer.

Ok to commit?

-Y
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