Button onClick can be optional

[enguerranws]

I came across an issue: I did want to use this component as a submit button form a form element, but its typing doesn't allow the usage as a without a onClick prop.

I'm not sure passing onClick as optional is the best option, but even as a <button type="button">, I'm not sure we should constrain the user to pass a onClick prop.

Alternatively, we could pass onClick as optional if the button type attribute is submit or reset.

[garronej]

Agreed 100%
I think making onClick optional as you did is the best call.
Let's not be too restrictive.

[garronej]

@enguerranws I promise I'll be more reactive next time.