Load only test rake task for Ruby < 2.2

Author: lloeki

Rakefile

@@ -3,7 +3,7 @@
 # @type self: Rake::TaskLib
 
 # load rake tasks from tasks directory
-if RUBY_VERSION.start_with?("1.8.")
+if RUBY_VERSION < "2.2."
   import File.join(File.dirname(__FILE__) || Dir.pwd, "tasks", "test.rake")
 else
   Dir.glob(File.join(File.dirname(__FILE__) || Dir.pwd, "tasks", "**", "*.rake")) { |f| import f }