Setting thinpool default to false

According to docs https://github.com/puppetlabs/puppetlabs-lvm/blob/master/README.md, thinpool is default to false, but as we see in https://github.com/puppetlabs/puppetlabs-lvm/blob/master/manifests/logical_volume.pp#L24 it is default to undef and then it is always called in https://github.com/puppetlabs/puppetlabs-lvm/blob/master/manifests/logical_volume.pp#L92

Author: missingcharacter

manifests/logical_volume.pp

@@ -21,7 +21,7 @@
   $range             = undef,
   $size_is_minsize   = undef,
   $type              = undef,
-  $thinpool          = undef,
+  $thinpool          = false,
   $poolmetadatasize  = undef,
   $mirror            = undef,
   $mirrorlog         = undef,