Cannot import KubeConfig

I ran the sample code,

```
from kubeconfig import KubeConfig

conf = KubeConfig()
conf.set_context('new-context', cluster='other-cluster', user='my-user')
conf.use_context('new-context')
print(conf.view())
```
I got,
ImportError: cannot import name 'KubeConfig' from partially initialized module 'kubeconfig' (most likely due to a circular import)
