Can't run 0.3.1 samples in virtualenv - wrong urllib3 version

[drigz]

Steps to reproduce:

1. Start with a fresh Raspbian 2017-04-10 image
2. sudo apt-get install -y python3-virtualenv portaudio19-dev libffi-dev libssl-dev
3. python3 -m virtualenv -p python3 env
4. env/bin/pip install --upgrade pip
5. env/bin/pip install --upgrade google-assistant-sdk[samples]
6. env/bin/googlesamples-assistant-pushtotalk

Fails with:

RuntimeError: Requests dependency 'urllib3' must be version >= 1.21.1, < 1.22!

This appears to be because google-assistant-grpc pulls in urlli3b 1.20. I don't know what path the deps follow to lead to a version of requests that requires urllib3 1.21.

[proppy]

Fixed with https://github.com/googlesamples/assistant-sdk-python/releases/tag/0.3.2