Fix children removed from tags

src/index.ts

@@ -205,7 +205,10 @@ export default function ofm() {
                         hName: 'tag',
                         hProperties:  {
                             tag: tag,
-                        }
+                        },
+                        hChildren: [
+                            { type: 'text', value: tag }
+                        ]
                     }
                 }
             },