Use latest gauge version as default

[sriv]

The default gauge version is hard coded to 0.7.0.

How about defaulting the gauge version to the latest release? Something like this can set the default version:

require "net/http"
require "json"

puts JSON.parse(Net::HTTP.get URI('https://api.github.com/repos/getgauge/gauge/releases/latest'))["tag_name"]

I know this will break if there isn't an internet connection, but I am unsure what is the recommended pattern to keep defaults up to date in cookbooks.