Remove 0.x

[jimmywarting]

Following node LTS...

[coveralls]

Coverage remained the same at 97.949% when pulling d49e702 on jimmywarting:patch-1 into d7398c3 on form-data:master.

[alexindigo]

Thanks for the thought. But there are still some places with old versions of node,
so removing it for the sake of removing probably not the best strategy.

Let's wait until it blocks us from moving forward, then we'd remove it.

Thank you.