Removed list_id param as it's not required as per the issue #310
Removed list_id param as it's not required as per the issue #310

blackpioter/sendgrid-python,galihmelon/sendgrid-python,gabrielkrell/sendgrid-python,sendgrid/sendgrid-python,gabrielkrell/sendgrid-python,galihmelon/sendgrid-python,sendgrid/sendgrid-python,sendgrid/sendgrid-python,blackpioter/sendgrid-python,gabrielkrell/sendgrid-python,blackpioter/sendgrid-python,galihmelon/sendgrid-python