Update rotate-array.py
Update rotate-array.py

Added a new method
kamyu104/LeetCode,kamyu104/LeetCode,yiwen-luo/LeetCode,tudennis/LeetCode---kamyu104-11-24-2015,yiwen-luo/LeetCode,tudennis/LeetCode---kamyu104-11-24-2015,yiwen-luo/LeetCode,tudennis/LeetCode---kamyu104-11-24-2015,kamyu104/LeetCode,kamyu104/LeetCode,tudennis/LeetCode---kamyu104-11-24-2015,yiwen-luo/LeetCode,tudennis/LeetCode---kamyu104-11-24-2015,kamyu104/LeetCode,yiwen-luo/LeetCode