diet_test: xrange(10) --> range(10) for Python 3 (#289)
diet_test: xrange(10) --> range(10) for Python 3 (#289)

xrange() was removed in Python 3.  For counting to 10, `from six.moves import xrange` would be overkill.
rsepassi/tensor2tensor,tensorflow/tensor2tensor,vthorsteinsson/tensor2tensor,tensorflow/tensor2tensor,vthorsteinsson/tensor2tensor,vthorsteinsson/tensor2tensor,waterblue13/tensor2tensor,rsepassi/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,waterblue13/tensor2tensor,tensorflow/tensor2tensor,rsepassi/tensor2tensor,vthorsteinsson/tensor2tensor,waterblue13/tensor2tensor,rsepassi/tensor2tensor