avoid deprecation warning in sgd_separator
avoid deprecation warning in sgd_separator

Correction to avoid deprecation warning:
/home/user/anaconda3/envs/sklearn_pycon2015/lib/python3.5/site-packages/sklearn/utils/validation.py:386: DeprecationWarning: Passing 1d arrays as data is deprecated in 0.17 and willraise ValueError in 0.19. Reshape your data either using X.reshape(-1, 1) if your data has a single feature or X.reshape(1, -1) if it contains a single sample.
  DeprecationWarning)
jakevdp/sklearn_pycon2015