Problems with default waitUntil load in call to setContent

[spencerr-carimus]

pdf-puppeteer/src/convertHTMLToPDF.js

Line 27 in 19b3e9c

await page.setContent(html);

As it is now, this call to page.setContent uses the default waitUntil of load (https://github.com/puppeteer/puppeteer/blob/v1.11.0/docs/api.md#pagesetcontenthtml-options).

This causes some issues when you're trying to use a Handlebars and/or MJML template. It would be good if you could pass the waitUntil for setting the DOM content to whatever the user desires, defaulting to Puppeteer's default.