Adds update functionality

manifests/update.pp

-# @summary A short summary of the purpose of this class
+# @summary Updates Conda
 #
-# A description of what this class does
+# Has conda update itself using the idempotant update command
 #
 # @example
 #   include anaconda::update
 class anaconda::update {
+  exec { 'updateconda':
+    command  => 'conda update conda',
+    require  => Exec['initialinstallconda'],
+  }
 }