Update docs/settings.rst
Documented GOOGLE_APPLICATION_CREDENTIALS env var
@@ -46,6 +46,7 @@ DJANGO_AWS_SECRET_ACCESS_KEY AWS_SECRET_ACCESS_KEY n/a
DJANGO_AWS_STORAGE_BUCKET_NAME AWS_STORAGE_BUCKET_NAME n/a raises error
DJANGO_AWS_S3_REGION_NAME AWS_S3_REGION_NAME n/a None
DJANGO_GCE_STORAGE_BUCKET_NAME GS_BUCKET_NAME n/a raises error
+GOOGLE_APPLICATION_CREDENTIALS n/a n/a raises error
SENTRY_DSN SENTRY_DSN n/a raises error
DJANGO_SENTRY_LOG_LEVEL SENTRY_LOG_LEVEL n/a logging.INFO
MAILGUN_API_KEY MAILGUN_ACCESS_KEY n/a raises error
