Doesn't work with [TOC] (instead of [toc]

[wasmitonline]

My Markdown editor of choice creates Tables of Content with the tag [TOC] (in caps) instead of [toc]. So this plugin didn't work right out of the box until I found this issue. I tried to edit my markdown files and then everything worked as expected. But as I didn't want to edit my markdown files twice, I tweaked TableOfContents.phpa little bit and inserted a little elseif structure in the block that looks for the tag (following line 160).
The whole block looks like this now:

        // Replace [toc] in document
        $nodes = $domXPath->query('//p');
        foreach ($nodes as $node) {
            if (trim($node->nodeValue) === "[toc]") {
                $node->parentNode->replaceChild($div_element, $node);
                break;
            }
            elseif (trim($node->nodeValue) === "[TOC]") {
                $node->parentNode->replaceChild($div_element, $node);
                break;
            }
        }

As I am an absolute PHP noob, I'm sure this can be solved in a much more elegant way. But it works for me and might do so for others, so I'm suggesting to integrate this feature into the plugin.