Zone file fetcher uses address instead of name

[larrysalibra]

The fetchZoneFile() fetcher uses the stacks address instead of the name when trying to look up the zone file. This results in an invalid api call.

micro-stacks/packages/client/src/micro-stacks-client.ts

Line 711 in 2b3d6d0

async fetchZoneFile(): Promise<any> {