Bump pytest from 4.0.1 to 4.0.2

Bumps [pytest](https://github.com/pytest-dev/pytest) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@4.0.1...4.0.2)

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

Author: dependabot-support

Pipfile

@@ -9,5 +9,5 @@ pyfxa = "==0.6.0"
 [dev-packages]
 flake8 = "==3.6.0"
 flake8-isort = "==2.6.0"
-pytest = "==4.0.1"
+pytest = "==4.0.2"
 pytest-mock = "==1.10.0"