Mathew Hodson

The [`IsOnionV2Address` function comments](https://github.com/zmap/zlint/blob/d8b86f771ea068173826b2088f0c502c17eaaa8d/v3/util/onion.go#L46) say, "The second-to-the-right most label is a 16 character long, base32." The code actually seems to check the left-most label. Based on similar [code in `IsOnionV3Address`](https://github.com/zmap/zlint/blob/d8b86f771ea068173826b2088f0c502c17eaaa8d/v3/util/onion.go#L30-L34),...