Avoid warnings in the puppet forge by using 1.0.0 version

The warnings field in

http://forge.puppetlabs.com/api/v1/releases.json?module=ngiger/x2go&version=0.1.1

causes this issue with puppet module tool
https://github.com/puppetlabs/puppet/pull/1684

I believe dependency version 1.0.0 is the correct one