Update Hadoop docs link Closes #75

Author: awdeorio

README_Hadoop_Streaming.md

@@ -1,7 +1,7 @@
 Hadoop Streaming in Python
 ===========================
 
-This tutorial shows how to write MapReduce programs in Python that are compatible with [Hadoop Streaming](https://hadoop.apache.org/docs/r1.2.1/streaming.html).  We'll use Python's `itertools.groupby()` function to simplify our code.
+This tutorial shows how to write MapReduce programs in Python that are compatible with [Hadoop Streaming](https://hadoop.apache.org/docs/current/hadoop-streaming/HadoopStreaming.html).  We'll use Python's `itertools.groupby()` function to simplify our code.
 
 Install Madoop, a light weight MapReduce framework for education. Madoop implements the Hadoop Streaming interface.
 ```console