Updated sequential.py to conform to PEP8 guidelines.
Updated sequential.py to conform to PEP8 guidelines.

rajathkumarmp/BinPy,daj0ker/BinPy,daj0ker/BinPy,yashu-seth/BinPy,BinPy/BinPy,yashu-seth/BinPy,rajathkumarmp/BinPy,BinPy/BinPy