Sendgrid reply to param different than one checking now

Problem/Motivation

When I try to send an email with Sendgrid I discovered that the reply to param is named differently than the one we are checking now on.

if (isset($params['Reply-To']) && !empty($params['Reply-To'])) {
    $message['headers']['Reply-To'] = $params['Reply-To'];
  } 

Steps to reproduce

When going to /admin/config/services/sendgrid/test
you fill in your email and the reply to, if you debug your code in sendgrid_integration.module, I noticed reply is not in $params['Reply-to'] but in $params['reply_to']

Proposed resolution

Adding extra check for other reply to param

 if (isset($params['Reply-To']) && !empty($params['Reply-To'])) {
    $message['headers']['Reply-To'] = $params['Reply-To'];
  } else if (isset($params['reply_to']) && !empty($params['reply_to'])) {
    $message['headers']['Reply-To'] = $params['reply_to'];
  }