Options variable should be optional in sync.read

[HarelM]

The following is the typings for sync.read:

export namespace sync {
  function read(buffer: BufferInput, options: Options): PNG;
  function write(png: PNG, options: Options): PNG;
}

options in read should be optional according to docs.

[HarelM]

Also the return type of sync.write should be ArrayBuffer or something similar I guess and not PNG...