Merge pull request #297 from Netflix/pandas-comment

Add a comment to a tutorial regarding Pandas versions

Author: romain-intel

metaflow/tutorials/02-statistics/README.md

@@ -6,13 +6,16 @@ later examples to improve our playlist generator. You can optionally use the
 Metaflow client to eyeball the results in a Notebook, and make some simple
 plots using the Matplotlib library.**
 
+Please note that Episode 04, a follow-on to this episode, requires Pandas version 0.24.2.
+Please make sure that you install or upgrade/downgrade to Pandas 0.24.2.
+
 #### Showcasing:
 - Fan-out over a set of parameters using Metaflow foreach.
 - Using external packages like Pandas.
 - Plotting results in a Notebook.
 
 #### Before playing this episode:
-1. ```python -m pip install pandas```
+1. ```python -m pip install pandas==0.24.2```
 2. ```python -m pip install notebook```
 3. ```python -m pip install matplotlib```