Merge pull request DjangoGirls#1450 from mignonnesaurus/add-small-note-about-python-command-on-windows

Added small note to use `python` instead of `python3` for Windows.

Author: magul

en/django_installation/instructions.md

@@ -164,7 +164,7 @@ Before we do that, we should make sure we have the latest version of `pip`, the
 
 {% filename %}command-line{% endfilename %}
 ```
-(myvenv) ~$ python3 -m pip install --upgrade pip
+(myvenv) ~$ python -m pip install --upgrade pip
 ```
 
 ### Installing packages with requirements