Update TPC broken link in readme (cmu-db#143)

docker/tpch/README.md

@@ -1,6 +1,6 @@
 # How to generate data for TPC-H
 
-To generate data files download the latest TPC-H tools distribution from http://www.tpc.org/tpc_documents_current_versions/current_specifications.asp
+To generate data files download the latest TPC-H tools distribution from https://www.tpc.org/tpc_documents_current_versions/current_specifications5.asp
 
 Place the zip file in this directory and rename it to `tpc-h-tool.zip` then execute the following commands.
 
@@ -14,4 +14,4 @@ Execute this command to run `dbgen` with the provided `SCALE`. This will place t
 docker run --rm -t -e SCALE=.1 -v ${PWD}/output:/opt/tpch-output tpch:latest
 ```
 
-The resulting `.tbl` files can then be placed in `./data/tpch` to be used during benchmark execution.  Some small starter files are already present in that directory.
+The resulting `.tbl` files can then be placed in `./data/tpch` to be used during benchmark execution.  Some small starter files are already present in that directory.