vendor: add packages

vendor/github.com/pires/go-proxyproto/README.md

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+# go-proxyproto
+
+[![Build Status](https://travis-ci.org/pires/go-proxyproto.svg?branch=master)](https://travis-ci.org/pires/go-proxyproto)
+[![Coverage Status](https://coveralls.io/repos/github/pires/go-proxyproto/badge.svg?branch=master)](https://coveralls.io/github/pires/go-proxyproto?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/pires/go-proxyproto)](https://goreportcard.com/report/github.com/pires/go-proxyproto)
+
+A Go library implementation of the [PROXY protocol, versions 1 and 2](http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt),
+which provides, as per specification:
+> (...) a convenient way to safely transport connection
+> information such as a client's address across multiple layers of NAT or TCP
+> proxies. It is designed to require little changes to existing components and
+> to limit the performance impact caused by the processing of the transported
+> information.
+
+This library is to be used in one of or both proxy clients and proxy servers that need to support said protocol.
+Both protocol versions, 1 (text-based) and 2 (binary-based) are supported.
+
+## Installation
+
+```shell
+$ go get -u github.com/pires/go-proxyproto
+```
+
+## Usage
+
+### Client (TODO)
+
+### Server (TODO)
+
+## Documentation
+
+[http://godoc.org/github.com/pires/go-proxyproto](http://godoc.org/github.com/pires/go-proxyproto)