One more fix for IPv6 UDP support

For webtorrent#73

Author: feross

lib/parse_udp.js

@@ -7,8 +7,6 @@ var common = require('./common')
 function parseUdpRequest (msg, rinfo) {
   if (msg.length < 16) throw new Error('received packet is too short')
 
-  if (rinfo.family !== 'IPv4') throw new Error('udp tracker does not support IPv6')
-
   var params = {
     connectionId: msg.slice(0, 8), // 64-bit
     action: msg.readUInt32BE(8),
@@ -63,8 +61,6 @@ function parseUdpRequest (msg, rinfo) {
   return params
 }
 
-// HELPER FUNCTIONS
-
 var TWO_PWR_32 = (1 << 16) * 2
 
 /**