Merge pull request #12 from ron-wolf/patch-1

fix recipe: replace “reduce” with “sum”

Author: Zheyuan Chen

receipes/mapred.py

@@ -4,6 +4,6 @@
 (
 pipe(10) | range
          | (map, lambda x: x ** 2)
-         | (reduce, lambda acc, n: acc + n)
+         | sum
          | print
 )