Drop support for node 4

[jbandura]

According to ember-cli's site, the node version supported is the latest LTS, which happens to be Node 6. This probably means that we can drop support for Node 4.

[ro0gr]

@jbandura can you provide the link where ember-cli site exactly defines node support matrix please?

I only found this one from repo:
https://github.com/ember-cli/ember-cli/blob/master/docs/node-support.md

Seems like node@4.2 is still supported.

[jbandura]

yes, you're right - I've been guiding myself by ember-best-practices plugin (which doesn't support node 4) and the LTS recommended section (not supported - misread that). But you're right - it's not explicilty stated that node 4 is not supported anymore - my bad.

[ro0gr]

No worries. I just was curious if there were such a statement in the cli docs.

[michalsnik]

Ok so we're holding this proposition for now and will get back to this in a while.

[bryanhickerson]

I'm wondering if we can reconsider this issue. I'm hitting a node 4 specific failure in #239. Since the ember best practices plugin doesn't support node 4, it seems like it could be a barrier to migrating the ember best practices rules to eslint-plugin-ember.

[kellyselden]

As soon as April 30th hits, kill it with fire.