Bump faker from 0.8.17 to 0.9.0

Bumps [faker](https://github.com/joke2k/faker) from 0.8.17 to 0.9.0.
- [Release notes](https://github.com/joke2k/faker/releases)
- [Changelog](https://github.com/joke2k/faker/blob/master/CHANGELOG.rst)
- [Commits](joke2k/faker@v0.8.17...v0.9.0)

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

Author: dependabot-support

dev-requirements.txt

@@ -7,7 +7,7 @@ Flask==1.0.2
 # Testing
 pytest==3.7.1
 tox==3.2.1
-faker==0.8.17
+faker==0.9.0
 
 # Syntax checking
 flake8==3.5.0