Adjust onion address size to 96 (#26)

The onion size is 96: the address 80 and the port number 16 combined. This is what it says in [multiformats/multiaddr's list](https://github.com/multiformats/multiaddr/blob/master/protocols.csv#L13), and [here](multiformats/go-multiaddr#21 (comment)) See multiformats/go-multiaddr@e32e9cd

Author: RichardLitt

src/protocols.csv

@@ -11,5 +11,5 @@ hex-code,   dec-code,  size,  name
 0x01E0,     480,       0,     http
 0x01BB,     443,       0,     https
 0x01DD,     477,       0,     ws
-0x01BC,     444,       10,    onion
-0x0113,     275,       0,     libp2p-webrtc-star
+0x01BC,     444,       96,    onion
+0x0113,     275,       0,     libp2p-webrtc-star