remove 1.4, 1.5, 1.6 from supported versions
remove 1.4, 1.5, 1.6 from supported versions

we should only support the last 2 releases of golang
(since they release 1.x versions each year, this means we support the past 2 years)

notzippy/revel,birkirb/revel,runner-mei/revel,runner-mei/revel,notzippy/revel,notzippy/revel,birkirb/revel,revel/revel,birkirb/revel,revel/revel