Bump django from 1.11.29 to 2.2.24 in /xerror

Bumps [django](https://github.com/django/django) from 1.11.29 to 2.2.24.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.11.29...2.2.24)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

xerror/requirements.txt

@@ -7,7 +7,7 @@ billiard==3.3.0.23
 celery==3.1.23
 channels==0.17.0
 daphne==0.14.2
-Django==1.11.29
+Django==2.2.24
 kombu==3.0.35
 msgpack-python==0.4.7
 pytz==2016.6.1