settings: get SECRET_KEY from the env variables

Author: Kátia Nakamura

pyconbalkan/settings.py

@@ -22,7 +22,7 @@
 # See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = config('SECRET_KEY')
+SECRET_KEY = os.getenv('SECRET_KEY', config('SECRET_KEY'))
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = config('DEBUG', default=False, cast=bool)