Liquid support

[jalberto]

Will be great to have Liquid support as well as NJK

Thanks for your work!

[KyleMit]

Seems totally reasonable. The lookups are using async/await, so we're bound to shortcode templating languages that have async support.

Should be available in:

• JavaScript *.11ty.js
• Liquid *.liquid
• Nunjucks *.njk

We have to register each language individually, but shouldn't take too much work to add to the .eleventy.js file like this:

eleventyConfig.addNunjucksAsyncShortcode("tweet", async(tweetId) => {
    return await twitter.getTweet(tweetId, options)
});

Thanks for the suggestion!