Actually use DeprecationWarning for deprecation warnings.
Actually use DeprecationWarning for deprecation warnings.

Gustavo6046/ChatterBot,Reinaesaya/OUIRL-ChatBot,maclogan/VirtualPenPal,Reinaesaya/OUIRL-ChatBot,vkosuri/ChatterBot,gunthercox/ChatterBot,davizucon/ChatterBot