Update install.rst

[julzhk]

Small comment on the installation notes; django-browser-reload and wagtail-cache middleware don't seem to play nicely together

[vsalvino]

Question, have you tried setting WAGTAIL_CACHE=False in your settings (assuming django-browser-reload is only used in development). I'm curious if that will improve the development experience.

Technically I would assume this is working as intended, as the browser will literally cache the page as instructed and not reload it. So turning cache off in development might be the better option.