def compare_version
      c_version = Gem::Version.new(@current_version)
      l_version = Gem::Version.new(@last_version)

      if @current_version.nil? || c_version < l_version
        yield @current_version, @last_version
      end
    end
def compare_version
      c_version = Gem::Version.new(@current_version)
      l_version = Gem::Version.new(@last_version)

      if @current_version.nil? || c_version < l_version
        yield @current_version, @last_version
      end
    end
Compares the current version (if it exists) to
 the last version that needed a configuration
 change (if it exists). Assuming they exist and
 that the current version is behind the "last-config"
 version, execute a passed block.
 @return [void]