Make options optional

[olebergen]

Fixes #435

[antonmedv]

Tests failed.

[antongolub]

export async function question(query: string, {choices}: { choices?: string[] } = {}) {
  let completer = undefined
  if (Array.isArray(choices)) {
    completer = function completer(line: string) {
      const completions = choices
      const hits = completions.filter((c) => c.startsWith(line))
      return [hits.length ? hits : completions, line]
    }
  }

[olebergen]

My bad, this is my first PR. Thanks for the fix, should work now, I ran the tests and commited the suggested change.