Update and rename reverse-integer.py to 007_Reverse_Integer.py

Author: backendbuilderdev

reverse-integer.py renamed to 007_Reverse_Integer.py

@@ -33,3 +33,4 @@ def reverse3(self, x):
         s = cmp(x, 0)
         r = int(repr(s * x)[::-1])
         return s * r * (r < 2 ** 31)
+