Incorrect Month Normalization in normalizeRange Function

[wassim-ben-amor]

Hi,

I encountered an issue with the normalizeRange function in the inquirer-datepicker codebase. The function subtracts 1 from the month value, which leads to unexpected behavior and "Invalid Date" errors when creating moment objects. This substraction seems unnecessary and incorrect because it converts a correctly indexed month into an incorrect one.

Steps to Reproduce
1- Define a date object with the current month using new Date().getMonth(), which returns a 0-based index for the month.
2- Pass this object to the normalizeRange function.
3- The normalizeRange function subtracts 1 from the month value, resulting in an incorrect month value.
4- Create a moment object with the normalized date object.
The moment object returns "Invalid Date" due to the incorrect month value.