Switch to using the dep tool and update all the dependencies

vendor/google.golang.org/grpc/README.md

@@ -1,4 +1,4 @@
-#gRPC-Go
+# gRPC-Go
 
 [![Build Status](https://travis-ci.org/grpc/grpc-go.svg)](https://travis-ci.org/grpc/grpc-go) [![GoDoc](https://godoc.org/google.golang.org/grpc?status.svg)](https://godoc.org/google.golang.org/grpc)
 
@@ -16,23 +16,7 @@ $ go get google.golang.org/grpc
 Prerequisites
 -------------
 
-This requires Go 1.5 or later.
-
-A note on the version used: significant performance improvements in benchmarks
-of grpc-go have been seen by upgrading the go version from 1.5 to the latest
-1.7.1.
-
-From https://golang.org/doc/install, one way to install the latest version of go is:
-```
-$ GO_VERSION=1.7.1
-$ OS=linux
-$ ARCH=amd64
-$ curl -O https://storage.googleapis.com/golang/go${GO_VERSION}.${OS}-${ARCH}.tar.gz
-$ sudo tar -C /usr/local -xzf go$GO_VERSION.$OS-$ARCH.tar.gz
-$ # Put go on the PATH, keep the usual installation dir
-$ sudo ln -s /usr/local/go/bin/go /usr/bin/go
-$ rm go$GO_VERSION.$OS-$ARCH.tar.gz
-```
+This requires Go 1.6 or later.
 
 Constraints
 -----------