Bump pytest-pylint from 0.9.0 to 0.12.1

Bumps [pytest-pylint](https://github.com/carsongee/pytest-pylint) from 0.9.0 to 0.12.1.
- [Release notes](https://github.com/carsongee/pytest-pylint/releases)
- [Commits](carsongee/pytest-pylint@v0.9.0...0.12.1)

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

Author: dependabot-support

travis/requirements.txt

@@ -4,7 +4,7 @@ pytest-cov==2.5.1
 pytest-pep8==1.0.6
 pytest-leaks==0.2.2
 pytest-travis-fold==1.3.0
-pytest-pylint==0.9.0
+pytest-pylint==0.12.1
 flake8==3.5.0
 python-coveralls==2.9.1
 pylint==1.8.4