Remove node 4 and 5 support, End-Of-Life

[knownasilya]

The Node org has ended support for Node 4 in April and Node 5 in 2016, so we shouldn't be supporting these. Also the new maintained cli-table3 only supports node 6+.

https://github.com/nodejs/Release/blob/643af71ee8365efbdccaa134690425ea05931279/README.md#release-schedule

[juanjoDiaz]

I'm not sure if adding a library that was recently created and it's only tangentially used in json2csv really justifies a major version bump.

I was planning to create a very simple table cli just for our use case.
Another option would be to use a widely used table like https://www.npmjs.com/package/table since we don't need the multiple row/col span that's the main selling point of cli-table2 and I assume 3.

Wdyt?

[knownasilya]

I'm fine either way, but I think it still stands that we shouldn't be supporting a node version that Node itself doesn't.

I can actually see us doing something like json2csv ... | csv-table as a better solution. But in the end we will see more issues with Node 4 no matter what we use for table printing.

[juanjoDiaz]

Just give me a day or so and I'll come back with a simpler proposal for the pretty print :)

Regarding deprecating node 4 and 5. I have no problem with that. But I don't see a problem keeping it until we have to change it either. After all, people still use Node 0.10 :)

[knownasilya]

Yeah, and people still use Windows XP, doesn't mean they should haha

Sounds good regarding the pretty print