Remove constant for max length

Author: gunthercox

chatterbot/constants.py

@@ -3,17 +3,6 @@
 """
 from chatterbot import languages
 
-'''
-The maximum length of characters that the text of a statement can contain.
-The number 255 is used because that is the maximum length of a char field
-in most databases. This value should be enforced on a per-model basis by
-the data model for each storage adapter.
-
-DEPRECATED: This value is no longer as of ChatterBot 1.2.7. Statement tables
-are now created with a text field.
-'''
-STATEMENT_TEXT_MAX_LENGTH = 255
-
 '''
 The maximum length of characters that the text label of a conversation can contain.
 The number 32 was chosen because that is the length of the string representation