Unable to specify additional headers like <AllOrNoneHeader>

[skplunkerin]

For the Update (or any) endpoint, there's no way for me to include additional headers in the <soapenv:Header>. In particular, I need to include the <AllOrNoneHeader> in my Update requests (to make sure the update will rollback if any changes don't work) and have no way to do this.

Is this possible and not shown in the README.md?

[skplunkerin]

I made a fix for this and will create a PR