Fix mutiple files bug

[blastZ]

No description provided.

[tleunen]

Hi @blastZ, I'm all good with the changes, but could you explain a bit what was the bug to make sure I understand why it's required?

[blastZ]

Hi @tleunen, if you render multiple Gist components like
gists.map((gist) => (<Gist key={gist.id + gist.fileName} id={gist.id} file={gist.fileName} />))
you will get the same id of iframe, and the resize function will not work.

[tleunen]

Makes sense, thank you :)