Updates parse to handle array arguments

[ribordy]

PR to fix #10

package-lock.json seemed to be out of sync with package.json, so that autogenerated change is included as well.

Please let me know if you'd like me to bump up the minor version with this, or if there are any other tests I should add.

[rekmarks]

Closing in favor of #22, which is this PR but in TypeScript. Thank you for the original implementation, @ribordy. We'll make sure you get coauthor credits on the merge.