update README

README.md

@@ -18,6 +18,7 @@
 
 :exclamation::exclamation: !! For the reference fasta file, he reference definition line must not contain space or special character.
 ```
+{::options parse_block_html="true" /}
 <div class="panel panel-warning">
 **Warning**
 {: .panel-heading}
@@ -27,6 +28,7 @@ WARNING DESCRIPTION
 
 </div>
 </div>
+{::options parse_block_html="false" /}
 ```