v0.4.1

Changes

• the First argument of builder function must be a String.

Before:

const builder = Bemmer.create('aaa');

builder(null, { bbb: true });
// => "aaa aaa--bbb"

After:

const builder = Bemmer.create('aaa');

builder(null, { bbb: true });
// TypeError!

builder('', { bbb: true });
// => "aaa aaa--bbb"