Allow for named exports when importing

[perrin4869]

Adds support for importing as named exports from mjs modules:

import { po, mo } from 'gettext-parser';

Recent node does some parsing using cjs-module-lexer, and it can understand lines like module.exports.po, but it can't understand module.exports = { po: ... }.

[smhg]

That's great! Thank you!

[smhg]

Published as 4.1.0.