Only use two puppet versions in travis matrix.
Only use two puppet versions in travis matrix.

craigcarnell/puppet-redis,craigcarnell/puppet-redis,tiredpixel/puppet-redis,craigcarnell/puppet-redis,hypernova2002/puppet-redis,zapier/puppet-redis,tiredpixel/puppet-redis,hypernova2002/puppet-redis,zapier/puppet-redis,hypernova2002/puppet-redis,tiredpixel/puppet-redis,zapier/puppet-redis,thomasvandoren/puppet-redis