getCode() is missing a case for imageHtml

[phptek]

In embed/embed/src/Adaptors//File.php the getCode() method doesn't work properly for remote images.

As far as I can tell, there should be a clause for "imageHTML".

Adding the following clause to getCode() fixes the problem (Using v3.3.5 with PHP7.1)

    case 'imageHtml':
        return Utils::imageHtml($this->url,'', $this->imageWidth, $this->imageHeight);

This method's switch block is also missing a default. It should decide what is a suitable default to pass onto API consmers. Default to a dummy 1px x 1px image in an <img> element perhaps? Or throw an exception?

[oscarotero]

getCode() is not required to return a code, if the url has no code, it simply returns null, so no default block is needed.
But I'm ok with having a 'imageHtml' case to return an img html element. So if you create a pull request, I'll be happy to merge it.
Thanks!

[phptek]

Will do. Many thanks.

[phptek]

@oscarotero Done. See #294 :-)