PromiseKit 4.5 does not build with pods.WORKSPACE

I'm trying to get PromiseKit 4.5 running with pods.WORKSPACE

```
new_pod_repository(
name = "PromiseKit",
url = "https://github.com/mxcl/PromiseKit/archive/4.5.0.zip",
generate_module_map = 1,
)

```

but I'm getting

```
error: use of undeclared type 'Promise'

import PromiseKit

public extension Promise {}
```

5.0 and forward versions seems to work well