chore(travis): don't support Go 1.0/1.1 anymore
chore(travis): don't support Go 1.0/1.1 anymore

Go has been backwards compatible so I don't see it as a big thing to
require downstream libraries to use a more modern version. I've tagged
old version as `1.0.0` to allow importing that version using [1].

[1] http://labix.org/gopkg.in

JensRantil/go-csv