Update README.md

README.md

@@ -9,6 +9,7 @@ If you'd like to just run the stream, clone this repo. The stream will handle in
 /ngen-datastream/scripts/stream.sh /ngen-datastream/configs/conf_datastream_daily.json
 ```
 requires `jq` and `wget`
+also requires `pip install pytz`
 
 ### Example `conf_datastream.json`
 ```