Log Message:
Update ruby-http to 2.0.3.

## 2.0.3 (2016-08-03)

* [#365](https://github.com/httprb/http/issues/365)
  Add `HTTP::Response#content_length`
  ([@janko-m])

* [#335](https://github.com/httprb/http/issues/335),
  [#360](https://github.com/httprb/http/pull/360)
  Set `Content-Length: 0` header for `nil` bodies.
  ([@britishtea])

## 2.0.2 (2016-06-24)

* [#353](https://github.com/httprb/http/pull/353)
  Avoid a dependency cycle between Client and Connection classes.
  ([@jhbabon])

## 2.0.1 (2016-05-12)

* [#341](https://github.com/httprb/http/pull/341)
  Refactor some string manipulations so they are more performant
  (up to 3-4x faster) and more concise.
  ([@tonyta])

* [#339](https://github.com/httprb/http/pull/341)
  Always use byte methods when writing/slicing the write buffer.
  ([@zanker])

## 2.0.0 (2016-04-23)

* [#333](https://github.com/httprb/http/pull/333)
  Fix HTTPS request headline when sent via proxy.
  ([@Connorhd])

* [#331](https://github.com/httprb/http/pull/331)
  Add `#informational?`, `#success?`, `#redirect?`, `#client_error?` and
  `#server_error?` helpers to `Response::Status`.
  ([@mwitek])

* [#330](https://github.com/httprb/http/pull/330)
  Support custom CONNECT headers (request/response) during HTTPS proxy requests.
  ([@smudge])

* [#319](https://github.com/httprb/http/pull/319)
  Drop Ruby 1.9.x support.
  ([@ixti])

## 1.0.4 (2016-03-19)

* [#320](https://github.com/httprb/http/pull/320)
  Fix timeout regression.
  ([@tarcieri])

## 1.0.3 (2016-03-16)

* [#314](https://github.com/httprb/http/pull/314)
  Validate charset before forcing encoding.
  ([@kylekyle])

* [#318](https://github.com/httprb/http/pull/318)
  Remove redundant string allocations upon header names normalization.
  ([@ixti])