nanshe/nanshe/nanshe_learner.py: Change `__date__` to conform to the standard.
nanshe/nanshe/nanshe_learner.py: Change `__date__` to conform to the standard.

jakirkham/nanshe,nanshe-org/nanshe,DudLab/nanshe,jakirkham/nanshe,nanshe-org/nanshe,DudLab/nanshe