Update README.md correct quickstart install requirements.lock

Author: chrisjsimpson

README.md

@@ -144,7 +144,7 @@ Create python environment and run flask:
 python3 -m venv venv # Create a python3.x virtual environment
 . venv/bin/activate # Activate the virtualenv
 # If you are on Windows, use: . venv/Scripts/Activate 
-pip install -r requirements.txt # Install requirements
+pip install -r requirements.lock # Install requirements
 export FLASK_APP=subscribie
 export FLASK_DEBUG=1
 flask db upgrade