Bump boto3 from 1.5.36 to 1.6.0

Bumps [boto3](https://github.com/boto/boto3) from 1.5.36 to 1.6.0.
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/boto3/compare/1.5.36...1.6.0)

requirements.txt

@@ -17,7 +17,7 @@ requests==2.18.4
 datadog==0.8.0
 networkx==1.11
 pathlib2==2.1.0
-boto3==1.5.36
+boto3==1.6.0
 
 # Needed for the mongo_* modules (playbooks/library/mongo_*)
 pymongo==3.2.2

requirements3.txt

 # Needed for SES limits check job
-boto3==1.5.36
+boto3==1.6.0
 awscli==1.14.45