Updated manifest to require version 28 for rich notifications
Updated manifest to require version 28 for rich notifications

stevenqzhang/tabwrangler,tabwrangler/tabwrangler,SpenceKonde/tabwrangler,stevenqzhang/tabwrangler,tabwrangler/tabwrangler,jacobSingh/tabwrangler,SpenceKonde/tabwrangler,tabwrangler/tabwrangler,stevenqzhang/tabwrangler,jacobSingh/tabwrangler,SpenceKonde/tabwrangler