Change name of ip function to remove masking of ip command in bash

Hi there,
I would like to contribute this change. It occured that using the hawaii50 theme results in masking the ```ip``` command. Hence, ```ip addr``` resulted in something unexpected like: 
```bash
$ ip addr
addr:123.123.123.123${IP_SEPARATOR}addr:123.123.123.123${IP_SEPARATOR}addr:127.0.0.1, 123.123.123.123
```
Hence, I changed the function name in ```hawaii50.theme.bash``` to ```get_ip_info```.
Hope this helps. My local problem is solved using this approach.
Kind regards!
Eike