fix #460

resource/js/util/markdown-it/blockdiag.js

@@ -10,7 +10,7 @@ export default class BlockdiagConfigurer {
   configure(md) {
     md.use(require('markdown-it-blockdiag'), {
       generateSourceUrl: this.generateSourceUrl,
-      marker: '`',
+      marker: '```',
     });
   }
 }