title: Mermaid syntax error on trying render a diagram on Github .md file
body: <p>I've followed this <a href="https://mermaid-js.github.io/mermaid/#/sequenceDiagram" rel="nofollow noreferrer">MermaId tutorial</a> but when I try put into my .md file on Github an error is raised:</p>
  <p><a href="https://i.stack.imgur.com/oW31j.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oW31j.png" alt="enter image description here" /></a></p>
  <p>This works perfectely on <a href="https://mermaid-js.github.io/mermaid-live-editor/edit/#eyJjb2RlIjoiICAgIHNlcXVlbmNlRGlhZ3JhbVxuICAgICAgICBhdXRvbnVtYmVyXG4gICAgICAgIEFsaWNlLT4-Sm9objogSGVsbG8gSm9obiwgaG93IGFyZSB5b3U_XG4gICAgICAgIGxvb3AgSGVhbHRoY2hlY2tcbiAgICAgICAgICAgIEpvaG4tPj5Kb2huOiBGaWdodCBhZ2FpbnN0IGh5cG9jaG9uZHJpYVxuICAgICAgICBlbmRcbiAgICAgICAgTm90ZSByaWdodCBvZiBKb2huOiBSYXRpb25hbCB0aG91Z2h0cyFcbiAgICAgICAgSm9obi0tPj5BbGljZTogR3JlYXQhXG4gICAgICAgIEpvaG4tPj5Cb2I6IEhvdyBhYm91dCB5b3U_XG4gICAgICAgIEJvYi0tPj5Kb2huOiBKb2xseSBnb29kISIsIm1lcm1haWQiOiJ7XG4gIFwidGhlbWVcIjogXCJkZWZhdWx0XCJcbn0iLCJ1cGRhdGVFZGl0b3IiOmZhbHNlLCJhdXRvU3luYyI6dHJ1ZSwidXBkYXRlRGlhZ3JhbSI6ZmFsc2V9" rel="nofollow noreferrer">Live editor.</a></p>
  <p>Code:</p>
  <pre><code>    ```mermaid
      sequenceDiagram
          autonumber
          Alice-&gt;&gt;John: Hello John, how are you?
          loop Healthcheck
              John-&gt;&gt;John: Fight against hypochondria
          end
          Note right of John: Rational thoughts!
          John--&gt;&gt;Alice: Great!
          John-&gt;&gt;Bob: How about you?
          Bob--&gt;&gt;John: Jolly good!
      ```
  </code></pre>
  <p>Someone can help me find my error on try write it on Github</p>