Sendgrid-nodejs: Syntax error in sample sendgrid node.js code, during run time.

Issue Summary

I am getting a Syntax error in mail.js when I copied the sample sendgrid code and tried to run it on my server

Steps to Reproduce

1. npm install @sendgrid/mail
2. exported environment variable SENDGRID_API_KEY in my bash environment
3. Copied the sample code

const sgMail = require('@sendgrid/mail');
sgMail.setApiKey(process.env.SENDGRID_API_KEY);
const msg = {
  to: '[email protected]',
  from: '[email protected]',
  subject: 'Sending with SendGrid is Fun',
  text: 'and easy to do anywhere, even with Node.js',
  html: '<strong>and easy to do anywhere, even with Node.js</strong>',
};
sgMail.send(msg);

Last step:
Run the code

# node sendgrid.js
/root/scripts/node_modules/@sendgrid/mail/src/mail.js:6
const {
      ^

SyntaxError: Unexpected token {
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/root/scripts/sendgrid.js:1:78)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)

Technical details:

# npm list |grep sendgrid
├─┬ @sendgrid/[email protected]
│ ├─┬ @sendgrid/[email protected]
│ │ ├── @sendgrid/[email protected] deduped
│ └─┬ @sendgrid/[email protected]
├─┬ [email protected]
│ └── [email protected]
npm ERR! extraneous: [email protected] /root/scripts/node_modules/jsprim/node_modules/assert-plus
npm ERR! extraneous: [email protected] /root/scripts/node_modules/verror/node_modules/assert-plus
npm ERR! extraneous: [email protected] /root/scripts/node_modules/dashdash/node_modules/assert-plus
npm ERR! extraneous: [email protected] /root/scripts/node_modules/getpass/node_modules/assert-plus
npm ERR! extraneous: [email protected] /root/scripts/node_modules/sshpk/node_modules/assert-plus

# npm -v 
5.3.0
# node -v
v4.8.4
# echo $SENDGRID_API_KEY
SG.jyr8dVjFTBO4MayuTAS_zA.7a9Qg_XXXXXX