Update README.md
to get the source right
@@ -65,7 +65,7 @@ There is currently only one bundle of `go-libp2p`, this package. This bundle is
### Install
```bash
-> go get -d github.com/libp2p/go-libp2p/...
+> go get -u -d github.com/libp2p/go-libp2p/...
> cd $GOPATH/src/github.com/libp2p/go-libp2p
> make
> make deps
