Update installation.rst

[Abhi5h3k]

python -m pip install -U 'channels[daphne]'

Gives Error: Tested on Windows ERROR: Invalid requirement: "'channels[daphne]'"

[carltongibson]

It's unlikely we'll merge this.

Originally we had without the quotes. Then many people started using zsh, which requires them. So folks opened PRs to add them.

You're on Windows. Q: Do you get the same error with Powershell?

[smithdc1]

When using powershell using quotes works for me - without quotes works too.

[carltongibson]

Thanks David. Let's close.