[issue] plugin uses the wrong thumbnail

hey folks,
the facebook linter says, that my Website uses a thumbnail which is too small:

og:image should be larger:
Provided og:image is not big enough. Please use an image that’s at least 200×200 px. Image ‘http://stura.hft-leipzig.de/wp-content/uploads/2013/05/IMG_5927-300×200.jpg’ will be used instead.

the plugin uses the 150*150 px picture.
this issue should be solved in a new release.

the whole debug can be found here:
https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fstura.hft-leipzig.de%2F2013%2Fstura-sitzung-am-29-mai%2F

http://wordpress.org/extend/plugins/facebook-page-publish-2/