Release 2.1.0

• Added __eq__ and __setitem__ methods to Vector class.
• Improved time complexity of __len__ and modulus method.
• Rectified error in __add__ and __sub__ method.
• __init__ can now handle lists and arrays apart from numbers as an arguement.
• Improvised __repr__ method. A vector now looks like this <1, 0, 0> instead of [1, 0, 0].
• Added is_unit and is_parellel methods.
• Improved comments in matmath.py which can be accessed by using help() method.