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Add exdocs and update README badges

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README.md
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# PlugOpenTracing
[![Build Status](https://travis-ci.org/nmohoric/plug_opentracing.svg?branch=master)](https://travis-ci.org/nmohoric/plug_opentracing)
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[![Hex.pm](https://img.shields.io/hexpm/v/plug_opentracing.svg)](https://hex.pm/packages/plug_opentracing)
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[![Documentation](https://img.shields.io/badge/Documentation-online-c800c8.svg)](http://hexdocs.pm/plug_opentracing)
An Elixir Plug for adding OpenTracing instrumentation.
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mix.exs
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defp deps do
[
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{:ex_doc, ">= 0.0.0", only: :dev},
{:plug, "~> 1.3"},
{:ibrowse, "~> 4.4"},
{:otter, "~> 0.2.0"},
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mix.lock
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%{"ibrowse": {:hex, :ibrowse, "4.4.0", "2d923325efe0d2cb09b9c6a047b2835a5eda69d8a47ed6ff8bc03628b764e991", [], [], "hexpm"},
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%{"earmark": {:hex, :earmark, "1.2.3", "206eb2e2ac1a794aa5256f3982de7a76bf4579ff91cb28d0e17ea2c9491e46a4", [], [], "hexpm"},
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"ex_doc": {:hex, :ex_doc, "0.18.1", "37c69d2ef62f24928c1f4fdc7c724ea04aecfdf500c4329185f8e3649c915baf", [], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm"},
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"ibrowse": {:hex, :ibrowse, "4.4.0", "2d923325efe0d2cb09b9c6a047b2835a5eda69d8a47ed6ff8bc03628b764e991", [], [], "hexpm"},
"mime": {:hex, :mime, "1.1.0", "01c1d6f4083d8aa5c7b8c246ade95139620ef8effb009edde934e0ec3b28090a", [], [], "hexpm"},
"otter": {:hex, :otter, "0.2.0", "0ca08e94db43c9ef6bf22a9b803a776880841e9f7fbf7b9207ade0cdeb0c6251", [], [], "hexpm"},
"plug": {:hex, :plug, "1.4.3", "236d77ce7bf3e3a2668dc0d32a9b6f1f9b1f05361019946aae49874904be4aed", [], [{:cowboy, "~> 1.0.1 or ~> 1.1", [hex: :cowboy, repo: "hexpm", optional: true]}, {:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}], "hexpm"}}