Bump certifi from 2017.11.5 to 2018.11.29

Bumps [certifi](https://github.com/certifi/python-certifi) from 2017.11.5 to 2018.11.29.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/commits/2018.11.29)

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

Author: dependabot-support

Pipfile

@@ -8,7 +8,7 @@ toml = "*"
 coveralls = "*"
 
 [packages]
-certifi = "==2017.11.5"
+certifi = "==2018.11.29"
 chardet = "==3.0.4"
 docopt = "==0.6.2"
 idna = "==2.6"