Consider hardcoded format requires for client-side support

[aklos]

First of all, thanks for this nice library. It works great server-side, but it doesn't support client-side because of the use of fs.

Is there any reason why it can't require the VRM formats like below?

const formats = [
	require('./diplomatic.js'),
	require('./gb-1903.js'),
	require('./gb-1932.js'),
	require('./gb-1963.js'),
	require('./gb-1983.js'),
	require('./gb-2001.js'),
	require('./military.js'),
	require('./ni-1903.js'),
	require('./ni-1966.js')
];

Discovering the formats dynamically is better, but the list of formats seems pretty static.