Update README.md

1st PR - Removing '$' for standard and consistancy across Kubernetes documentation

README.md

@@ -42,17 +42,17 @@ If you want to build Kubernetes right away there are two options:
##### You have a working [Go environment].

```
$ go get -d k8s.io/kubernetes
$ cd $GOPATH/src/k8s.io/kubernetes
$ make
go get -d k8s.io/kubernetes
cd $GOPATH/src/k8s.io/kubernetes
make
```

##### You have a working [Docker environment].

```
$ git clone https://github.com/kubernetes/kubernetes
$ cd kubernetes
$ make quick-release
git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make quick-release
```

For the full story, head over to the [developer's documentation].