[Bug] Use of [] in python package names

[Varshith Sreeramdass <varshiths@xxxxxxxxxxxxxx>]

I use zsh 5.7.1.

To install spacy with GPU support, the command involved is

   /$ pip install -U spacy[cuda100]/

While it works perfectly on bash, zsh throws the following error.

/        zsh: no matches found: spacy[cuda100]/

I guess this is an issue with how [] are dealt.
I am not sure if this is an artefact of using oh-my-zsh 
<https://github.com/robbyrussell/oh-my-zsh> (which is unlikely as it 
does not have access to zsh's parser).

I assume this is the way to file a bug, given that source-forge 
<https://sourceforge.net/p/zsh/bugs/> doesn't seem to accept tickets. 
Apologies otherwise.

Thank you.