Add --user flag to instructions

Signed-off-by: Sachin S. Kamath <sskamath96@gmail.com>

README.md

@@ -5,7 +5,8 @@ The web application for the Hodor Project
 ## Quickstart
 * Clone the repo using `git clone https://git.amrita.edu/hodorsec/hodor-webapp`
 * Create a virtualenv and activate it.
-* After activating it, `pip install -r requirements.txt` to install dependencies.
+* After activating it, `pip install --user -r requirements.txt` to 
+install dependencies.
 * `./runserver.py` to run the app.
 * Navigate to `http://127.0.0.1:8080` to watch it in action!