Fix error in readme instructions

This line: https://github.com/nytlabs/hive/blame/master/README.md#L24

```
Download the [latest release](https://github.com/nytlabs/hive/releases) and double click to start. `hive` will be running on http://localhost:8080 by default.
```

There are no tagged releases. It is confusing for user trying to set up. :-(
