Mention that jinja2 is a dependency.

jbalogh · jbalogh · commit 2076f75d4357 · 2014-03-19T09:34:49.000-07:00
diff --git a/README.md b/README.md
@@ -55,7 +55,7 @@ pandas (&gt;=0.13) for this to work properly
 You can get these using `pip`:
 
 ```
-pip install ipython pandas numpy tornado pyzmq
+pip install ipython pandas numpy tornado pyzmq jinja2
 ```
 
 This can be difficult to get set up and require you to compile 
