cannot currently use employee_number with hris.employees.list

```
# frozen_string_literal: true

require_relative "lib/merge_ruby_client"

merge_client = Merge::Client.new(
  api_key: "xxx",
  account_token: "xxx"
)

begin
  response = merge_client.hris.employees.list(
    employee_number: "9876",
  )
rescue StandardError => e
  puts e.message
end
```

```
❯ ruby example_list_call.rb

unknown keyword: :employee_number
```