Fix misspelling in User struct and add JSON tags

[heimweh]

Hi,
I'm using this library in a Terraform provider and noticed that I can't really create a user with the current User struct.

I modified the User struct like this to get it to work.

Please note that I'm very new to Go and my code might have faults in it,
but at least I got it to work with this change.

[heimweh]

The original error I got from the API without the modified struct.

$ terraform apply
pagerduty_user.foo: Creating...
  email:     "" => "[email protected]"
  job_title: "" => "Job title"
  name:      "" => "Foo Bar"
Error applying plan:

1 error(s) occurred:

* pagerduty_user.foo: Failed call API endpoint. HTTP response code: 400. Error: &{2001 Invalid Input Provided [Name must be a String.]}

https://github.com/heimweh/terraform-provider-pagerduty

[ranjib]

@heimweh ID comes from APIObject struct, which we are embedding here. You can omit this attribute

[heimweh]

Ah, missed that completely. I'll omit that attribute :) Thanks!

[ranjib]

@heimweh looks good to me. Just remove the ID field.

[heimweh]

@ranjib thanks for the response, I'll have a look at getting this fixed asap.

[heimweh]

@ranjib should be fixed now

[ranjib]

thank you :-)