Add pyc files to .gitignore

[powerfool]

We should make sure pyc files don't end up in the production environment as this can cause issues since we use a different database locally and on Heroku.
This adds "*.pyc" to .gitignore so they are excluded.

It's also recommended in the "Getting started with Django" guide at Heroku:
https://devcenter.heroku.com/articles/getting-started-with-django#gitignore

I have seen some people doing the tutorial having issues with their database, like here:
http://stackoverflow.com/questions/28788452/django-via-heroku-auth-user-error

I had the same issue and I solved it by removing pyc files locally and in production and making sure they are never sent again to Heroku.

[sodevious]

I think because this tutorial uses python3, that there shouldn't be .pyc files, just __pycache__ folders?

[aniav]

I believe @sodevious is right about pyc files. Therefore I will close this pull request, thank you! ✨

[powerfool]

You're right, my bad.
Perhaps add a note about that though. Some people might go with the same settings to a new project without using python 3, they wouldn't know what's wrong.
Thanks for reviewing though :)