update README.md

Author: czheo

README.md

@@ -113,6 +113,10 @@ print(1 /to/ INF /take/ 5)
 # there is a `take` funciton which is similar to itertools.islice
 # return [1, 2, 3, 4, 5]
 
+print(0 /to/ NEGINF /by/ 2 /take/ 5)
+# also works with negative infinity.
+# return [0, -2, -4, -6, -8]
+
 # print all combinations of [1..3] * [4..6]
 print([(x, y) for x, y in (1 /to/ 3) * (4 /to/ 6)])
 # return [(1, 4), (1, 5), (1, 6), (2, 4), (2, 5), (2, 6), (3, 4), (3, 5), (3, 6)]