Update example for new API

Fix webtorrent#166

Author: feross

examples/tracker-scrape.md

@@ -12,14 +12,18 @@ npm install browserify parse-torrent bittorrent-tracker
 var Tracker = require('bittorrent-tracker')
 var magnet = require('magnet-uri')
 
-// These values don't matter
-var peerId = new Buffer('01234567890123456789')
-var port = 6889
-
 var magnetURI = "magnet:?xt=urn:btih:6a9759bffd5c0af65319979fb7832189f4f3c35d&dn=sintel.mp4&tr=udp%3A%2F%2Fexodus.desync.com%3A6969&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.internetwarriors.net%3A1337&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=wss%3A%2F%2Ftracker.btorrent.xyz&tr=wss%3A%2F%2Ftracker.fastcast.nz&tr=wss%3A%2F%2Ftracker.openwebtorrent.com&tr=wss%3A%2F%2Ftracker.webtorrent.io&ws=https%3A%2F%2Fwebtorrent.io%2Ftorrents%2Fsintel-1024-surround.mp4"
 
 var parsedTorrent = magnet(magnetURI)
-var client = new Tracker(peerId, port, parsedTorrent)
+
+var opts = {
+  infoHash: parsedTorrent.infoHash,
+  announce: parsedTorrent.announce,
+  peerId: new Buffer('01234567890123456789'), // hex string or Buffer
+  port: 6881 // torrent client port
+}
+
+var client = new Tracker(opts)
 
 client.scrape()