[theme-reviewers] How to update screenshot.png for activetab theme?

[Vitaly]

The screenshot.png for the activetab theme is outdated -
http://wordpress.org/themes/activetab
http://wp-themes.com/wp-content/themes/activetab/screenshot.png

It was changed in the last theme update -
http://themes.trac.wordpress.org/browser/activetab/0.4.3/screenshot.png

How to update screenshot.png for activetab theme?
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