bump supported version up to 4.0

git-svn-id: https://plugins.svn.wordpress.org/all-in-one-wp-migration/trunk@999045 b8457f37-d9ea-0310-8a92-e5e31aec5664
bump version to 2.0.2

git-svn-id: https://plugins.svn.wordpress.org/all-in-one-wp-migration/trunk@999055 b8457f37-d9ea-0310-8a92-e5e31aec5664