Updating the link to zookeeper in README

The original link doesn't work anymore

README.md

@@ -30,7 +30,7 @@ sudo update-alternatives --config g++;
 ### c. Application binaries
 Cords intends to test different distributed storage systems. You need to install your target distributed storage system. For example, to if you want to test ZooKeeper-3.4.8, you need to:
 
-wget http://www.webhostingreviewjam.com/mirror/apache/zookeeper/zookeeper-3.4.8/zookeeper-3.4.8.tar.gz; tar -xvzf zookeeper-3.4.8.tar.gz
+```wget http://mirrors.ocf.berkeley.edu/apache/zookeeper/zookeeper-3.4.12/zookeeper-3.4.12.tar.gz; tar -xvzf zookeeper-3.4.8.tar.gz```
 
 Also, you need to build and install the ZooKeeper binaries (you will need JDK, JRE, and maven for this). Similarly, you need to build and install all its dependencies. 
 
@@ -59,4 +59,4 @@ Aishwarya Ganesan ([email protected]) and Ramnatthan Alagappan ([email protected]) are
 
 The CORDS framework and the results are by-products of the distributed storage reliability research project (http://research.cs.wisc.edu/adsl/Publications/) at ADSL at the University of Wisconsin-Madison. Please <a href="http://research.cs.wisc.edu/adsl/Publications/cords-fast17.bib">cite this paper</a>, if you use this framework or results.  
 
-If you want to use CORDS for your data store, or if you wish to get the workloads and testing results for a system that we have discussed in the paper, please drop us a mail at [email protected] or [email protected].
+If you want to use CORDS for your data store, or if you wish to get the workloads and testing results for a system that we have discussed in the paper, please drop us a mail at [email protected] or [email protected].