margins around flowchart are not balanced

[renanlecaro]

Thank your for making this awesome library ! I'm working on a google docs integration. I've encountered some difficulties along the way so i'll report them in separate issues.

When rendering a flow chart, the top and left margins are set by mermaid.render(), but the bottom and right are not.

See first item in this codepen : https://codepen.io/renanlecaro/pen/rEBBKQ

So i've been adding 25 px to the width and height of the svg to compensate, but maybe there's a better way ? Is this a bug ?

[renanlecaro]

Turns out using mermaid.init instead of mermaid.render solved this, so i guess we can close it