Installation instructions for virtualenv should specify python3

[jasonaowen]

Details

The installation instructions say:

Create a virtual environment and activate it:

virtualenv venv
source venv/bin/activate

On Ubuntu 18.04, the virtualenv binary provided by the virtualenv package defaults to using python2, as shown by virtualenv --help:

  -p PYTHON_EXE, --python=PYTHON_EXE
                        The Python interpreter to use, e.g.,
                        --python=python2.5 will use the python2.5 interpreter
                        to create the new environment.  The default is the
                        python2 interpreter on your path (e.g.
                        /usr/bin/python2)

However, RTD no longer works with Python 2, and the subsequent pip install step fails as a result.

Instead, I needed to run virtualenv --python=python3 venv to build a suitable virtual environment.

Expected Result

A venv into which I could install the requirements

Actual Result

A venv that used python2

[stale]

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