Bump pytest from 4.2.0 to 4.2.1 (#87)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@4.2.0...4.2.1)

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 codacy-coverage==1.3.11
 mock==2.0.0
 pytest-cov==2.6.1
-pytest==4.2.0
+pytest==4.2.1
 paramiko==2.4.2
 python-digitalocean==1.13.2
 six==1.12.0