Typo in `InputError` raised by `Textractor` constructor

[dross20]

Description

The constructor for the Textractor class requires that an argument be passed in for either profile_name or region_name. However, the InputError that's raised when both of these arguments are missing refers to the parameter as region instead of region_name:

amazon-textract-textractor/textractor/textractor.py

Lines 103 to 105 in f34c34a

	raise InputError(
	"Unable to initiate Textractor. Either profile_name or region requires an input parameter."
	)

This is a very minor inconsistency, but I think it can cause some confusion (it did for me)!