Add test for throwing on errors in plug-ins
Add test for throwing on errors in plug-ins

yukkurisinai/mdast,yukkurisinai/mdast,ulrikaugustsson/mdast,eush77/remark,eush77/remark,wooorm/remark,chcokr/mdast,ulrikaugustsson/mdast,tanzania82/remarks,chcokr/mdast