bump up version number in the plugin

git-svn-id: https://plugins.svn.wordpress.org/auto-image-field/trunk@937060 b8457f37-d9ea-0310-8a92-e5e31aec5664
still old version in wordpress.org

git-svn-id: https://plugins.svn.wordpress.org/auto-image-field/trunk@937061 b8457f37-d9ea-0310-8a92-e5e31aec5664