function `addrToPubKeyHash` should be named `addrToPkh`

As per `DashKeys.addrToPkh`: https://github.com/dashhive/DashKeys.js/issues/11.

https://github.com/search?q=org:dashhive%2520addrToPkh&type=code

https://github.com/search?q=org%3Adashhive+addrToPubKeyHash&type=code