Bump lazy-object-proxy from 1.3.1 to 1.7.1

Bumps [lazy-object-proxy](https://github.com/ionelmc/python-lazy-object-proxy) from 1.3.1 to 1.7.1.
- [Release notes](https://github.com/ionelmc/python-lazy-object-proxy/releases)
- [Changelog](https://github.com/ionelmc/python-lazy-object-proxy/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/ionelmc/python-lazy-object-proxy/compare/v1.3.1...v1.7.1)

---
updated-dependencies:
- dependency-name: lazy-object-proxy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -13,7 +13,7 @@ grpcio==1.16.0
 gunicorn==19.9.0
 idna==2.7
 isort==4.3.4
-lazy-object-proxy==1.3.1
+lazy-object-proxy==1.7.1
 mccabe==0.6.1
 protobuf==3.6.1
 pyasn1-modules==0.2.2