Bump falcon from 2.0.0 to 4.0.2

Bumps [falcon](https://github.com/falconry/falcon) from 2.0.0 to 4.0.2.
- [Release notes](https://github.com/falconry/falcon/releases)
- [Changelog](https://github.com/falconry/falcon/blob/master/RELEASE.md)
- [Commits](falconry/falcon@2.0.0...4.0.2)

---
updated-dependencies:
- dependency-name: falcon
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,7 +1,7 @@
 GeoAlchemy @ https://github.com/hozn/GeoAlchemy/archive/0.7.3dev1.tar.gz
 arrow==0.15.5
 envparse==0.2.0
-falcon==2.0.0
+falcon==4.0.2
 freezing-model @ https://github.com/freezingsaddles/freezing-model/archive/0.7.20.tar.gz
 greenstalk==1.0.1
 gunicorn==22.0.0