Bump celery from 4.4.7 to 5.0.0 (#138)

Bumps [celery](https://github.com/celery/celery) from 4.4.7 to 5.0.0.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/master/Changelog.rst)
- [Commits](https://github.com/celery/celery/compare/v4.4.7...v5.0.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

setup.py

@@ -39,7 +39,7 @@ setup(
         'Flask-WTF==0.14.3',
         'Flask-Caching==1.9.0',
         'geopy==2.0.0',
-        'celery==4.4.7',
+        'celery==5.0.0',
         'redis==3.5.3',
         'aerofiles==1.0.0',
         'geoalchemy2==0.8.4',