Update README.md

Author: nithishr

README.md

@@ -37,6 +37,8 @@ git clone https://github.com/couchbase-examples/python-quickstart.git
 
 The dependencies for the application are specified in the `requirements.txt` file in the source folder. Dependencies can be installed through `pip` the default package manager for Python.
 
+> Note: If your Python is not symbolically linked to python3, you need to run all commands using `python3` instead of `python`.
+
 ```shell
 cd src
 python -m pip install -r requirements.txt