Update README.md

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+++ b/README.md
@@ -22,9 +22,18 @@ Screenshot:
 You will need Python 2.7+ and pip.
 
 ```bash
+sudo pip install rainbowstream
+```
+
+or try it with a virtualenv
+```bash
+pip install virtualenv # skip if you already have virtualenv
+virtualenv venv 
+source venv/bin/activate # use the brand new virtualenv.
 pip install rainbowstream
 ```
 
+
 ## Usage
 #### The stream
 Just type