Make the options optional when using the client

[aminnairi]

Is your feature request related to a problem? Please describe.
It would be great to not be forced to not having to specify the options property in the client method when called and no options is necessary for this particular request.

Describe the solution you'd like
The options argument should be optional when sending a request.

// This
client.getKryptonians({parameters: null});

// Instead of this
client.getKryptonians({
  parameters: null,
  options: {}
});

Describe alternatives you've considered
Allow setting the options argument to null.

Additional context
None.