isRaw is undefined when calling utils.appendChild

[pgoldrbx]

Original comments: #5 (comment)

Calling utils.appendChild with a raw element throws an error.

const html = require('jsonml.js/lib/html');
const utils = require('jsonml.js/lib/utils');

const jml = ['div']
const rawEl = html.raw('foo');
utils.appendChild(jml, rawEl); // TypeError: exports.isRaw is not a function

Indeed, exports.isRaw is not defined within utils.js. It is, however, defined within html.js. So, the fix should be fairly straightforward.