Move to Node 8

[bmuenzenmeyer]

Dropping 6 in favor of 8 will move with the Node LTS "Active" schedule, the industry as a whole, and allow us to use newer language features like async / await

• nvmrcs
• travis environments
• package.json engines
• documentation / README / shields

[EvanLovely]

Love this. Gotta say: async / await is super handy & much more readable than other approaches.

[stale]

It's hard to keep track of everything. This issue has been automatically marked as stale because it has not had recent activity, neither from the team nor the community. It will be closed if no further activity occurs. Please consider adding additional info, volunteering to contribute a fix for this issue, or making a further case that this is important to you, the team, and the project as a whole. Thanks!

[benhalverson]

Hey @bmuenzenmeyer Do you mind if I work on this?

[stale]

It's hard to keep track of everything. This issue has been automatically marked as stale because it has not had recent activity, neither from the team nor the community. It will be closed if no further activity occurs. Please consider adding additional info, volunteering to contribute a fix for this issue, or making a further case that this is important to you, the team, and the project as a whole. Thanks!

[stale]

Issue closed after going stale. It can be re-opened if still relevant.