multiplexing versions

[pyramation]

In block explorers such as ping.pub, we need to write code that multiplexes versions.

(see example from ping.pub)

const getProposalFunction = (sdk_version) => { 
    switch(sdk_version) {
      case '0.46': 
        return client.cosmos.gov.v1.proposals;
      default:
        return client.cosmos.gov.v1beta1.proposals;
    }
}