title: Line connection (instead of arrow) in mermaid
body: <p>I'm trying to create a mermaid chart in R. The syntax seems to be quite straightforward - however I haven't found a possibility to make <strong>line connections</strong> between two shapes <strong>without</strong> an arrow head.</p>
  
  <p>In this example:</p>
  
  <pre><code>     mermaid("
          graph LR
              sq1[shape one]-- This can't be a shape. So sad. --&gt; sq2[shape two]
  
              cyr1((circle one))--&gt;cyr2((circle two));
        ")
  </code></pre>
  
  <p>will get
  <a href="https://i.stack.imgur.com/eTsmq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eTsmq.png" alt="enter image description here"></a></p>
  
  <p>Here, the connection between "shape one" and "this can't be a shape" is a line, but as soon as I try to use this connection between two shapes the output won't construct a diagram. Is there any way to realize a line connection between two shapes?</p>