0.0601
  add 'not_defined'
  add 'blank'
0.0503
  catch up with Validator::Custom vup
0.0502
  catch up with Object::Simple vup
0.0501
  delete upper case constraint (not backword compatible)
  delete sp, space constraint (not backword compatible)
  add define, not_space constraint
0.0402
  catch up Validator::Custom 0.0605 version up
0.0401
  catch up Validator::Custom 0.0401 version up
0.0301
  lower case constraint function is available
0.0201
  catch up Validator::Custom 0.0301 version up
0.0101
  First release