release 2.1.4

[bug] adding list serialization for sets to messages sent to sqs (air…

…bnb#867)

* adding list serialization for sets to messages sent to sqs

* addressing pr feedback and fixing test cases

* bumping version to 2.1.4

release 2.1.3

release 2.1.2

release 2.1.1

release 2.1.0

release 2.0.0

cutting release 1.6.1 with various bug fixes

Merge pull request airbnb#584 from airbnb/ryandeivert-1.6.0-bump

bumping version from 1.5.0 -> 1.6.0

Merge pull request airbnb#317 from airbnb/ryandeivert-cb-alert-watchl…

…ist-hit-feedsearch-binary-update

"other_hostnames" optional in "carbonblack:alert.watchlist.hit.feedsearch.binary"