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Update ruby-http to 2.2.2.
## 2.2.2 (2017-04-27)
* [#404](https://github.com/httprb/http/issues/404),
[#405](https://github.com/httprb/http/pull/405)
Make keepalive timeout configurable.
([@nestegg])
## 2.2.2 (2017-04-27)
* [#404](https://github.com/httprb/http/issues/404),
[#405](https://github.com/httprb/http/pull/405)
Make keepalive timeout configurable.
([@nestegg])