Change About's URL from https://clusterrunner.com/ to https://www.clusterrunner.com/

[lloydchang]

Relates to #447

Please change https://github.com/box/ClusterRunner

About:

ClusterRunner makes it easy to parallelize test suites across your infrastructure in the fastest and most efficient way possible.

clusterrunner.com

Specifically, change:
from:

[clusterrunner.com](https://clusterrunner.com/)
to:
[clusterrunner.com](https://www.clusterrunner.com/)

to prepend www. in front of clusterunner

to prevent Chrome from reporting the following:

Steps to reproduce:

1. Open Chrome
2. Go to https://github.com/box/ClusterRunner
3. In About, click https://clusterrunner.com/
4. The following error occurs:

Not Secure: https://clusterrunner.com/

Your connection is not private
Attackers might be trying to steal your information from clusterrunner.com (for example, passwords, messages, or credit cards). [Learn more](chrome-error://chromewebdata/#)
NET::ERR_CERT_COMMON_NAME_INVALID

This server could not prove that it is clusterrunner.com; its security certificate is from *.github.com. This may be caused by a misconfiguration or an attacker intercepting your connection.

[Proceed to clusterrunner.com (unsafe)](chro
me-error://chromewebdata/#)

Whereas the expected outcome should be:

[lloydchang]

Hi @mayurva, @rsennewald, @vikrambhat11, @cmcginty, @shriganeshs, @josephharrington, @nickzuber, @wjdhollow, @gcurtis, @aptxkid, @drobertduke, @cbrenton, @nzakas, @box-productivity-ci, @box,
Would you be able to change About's URL?
Thank you.

[lloydchang]

Hi @mayurva, @rsennewald, @vikrambhat11, @cmcginty, @shriganeshs, @josephharrington, @nickzuber, @wjdhollow, @gcurtis, @aptxkid, @drobertduke, @cbrenton, @nzakas, @box-productivity-ci, @box, when your time permits, any updates? Thank you!