Windows 10 PyAudio Installation Errors

For windows users, they might find it hard to install from the ```requirements.txt``` file and thus might require ```pipwin``` to install PyAudio successful at least it was for my case. 

I don't know how to create a pull request around this since we have frozen dependencies.

I had to;
```
pip install pipwin
```
Then
```
pipwin install pyaudio
```
