Update django-celery-beat from 1.4.0 to 1.5.0

Author: pyup-bot

requirements/base.txt

@@ -1,7 +1,7 @@
 celery==4.3.0
 dj-database-url==0.5.0
 django==2.2.2
-django-celery-beat==1.4.0
+django-celery-beat==1.5.0
 django-debug-toolbar==1.11
 django-ratelimit==2.0.0
 django-redis==4.10.0