Bump geopy from 1.20.0 to 1.21.0

Bumps [geopy](https://github.com/geopy/geopy) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/geopy/geopy/releases)
- [Changelog](https://github.com/geopy/geopy/blob/master/docs/changelog_1xx.rst)
- [Commits](https://github.com/geopy/geopy/compare/1.20.0...1.21.0)

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

setup.py

@@ -38,7 +38,7 @@ setup(
         'Flask-Bootstrap==3.3.7.1',
         'Flask-WTF==0.14.2',
         'Flask-Caching==1.8.0',
-        'geopy==1.20.0',
+        'geopy==1.21.0',
         'celery==4.4.0',
         'redis==3.4.0',
         'aerofiles==1.0.0',