Bump pathlib2 from 2.1.0 to 2.3.0

Bumps [pathlib2](https://github.com/mcmtroffaes/pathlib2) from 2.1.0 to 2.3.0.
- [Changelog](https://github.com/mcmtroffaes/pathlib2/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/mcmtroffaes/pathlib2/compare/2.1.0...2.3.0)

requirements.txt

@@ -16,7 +16,7 @@ awscli==1.14.45
 requests==2.18.4
 datadog==0.8.0
 networkx==1.11
-pathlib2==2.1.0
+pathlib2==2.3.0
 boto3==1.6.0
 
 # Needed for the mongo_* modules (playbooks/library/mongo_*)