v0.4.0

Use always-multiline for comma-dangle in the linter.

This will make both of the following an error:

const myObj = {
  foo: "foo",
  bar: "bar"  // Trailing comma required!
};
const myArray = [
  1,
  2  // Required here, too!
];

However, trailing commas inline are disallowed:

const myObj = { foo: "foo", bar: "bar", }; // Bad!
const myArray = [ 1, 2, ]; // Bad, too!