Update readme for new options
Update readme for new options

Add an example to show how to set the looger and merge_behavior options.

GeoffWilliams/puppet-hiera,oasys/puppet-hiera,vchepkov/puppet-hiera,hunner/puppet-hiera,redhat-cip/puppet-hiera,reidmv/puppet-hiera,GeoffWilliams/puppet-hiera,reidmv/puppet-hiera,logicminds/puppet-hiera,stwomack/puppet-hiera,arineng/puppet-hiera,arineng/puppet-hiera,oasys/puppet-hiera,stwomack/puppet-hiera,hunner/puppet-hiera,redhat-cip/puppet-hiera,logicminds/puppet-hiera,vchepkov/puppet-hiera