Release 3.2.0

• Completely moved away from twine in favour of poetry.
• Rename __pow__ method to pow in Vector class.
• Type hints added to all methods of both Matrix and Vector classes.
• Refactored multiple methods across both classes to improve time/space complexity.
• Added better type checking to __init__ method of Matrix class.
• Better support for __matmul__ method in Vector and Matrix classes.

NOTE: Python 3.6 and 3.7 are still supported even though they have reached EOL.