chore(package): update bittorrent-tracker to version 8.0.0

http://greenkeeper.io/
webtorrent · greenkeeperio-bot · Apr 1, 2016 · Apr 1, 2016 · 8e8e43ffa8affeedf02c4e985c2cb1f9cf6e8987
commit 8e8e43ffa8affeedf02c4e985c2cb1f9cf6e8987
diff --git a/package.json b/package.json
@@ -71,7 +71,7 @@
     "zero-fill": "^2.2.0"
   },
   "devDependencies": {
-    "bittorrent-tracker": "^7.0.0",
+    "bittorrent-tracker": "^8.0.0",
     "brfs": "^1.2.0",
     "browserify": "^13.0.0",
     "cross-spawn-async": "^2.0.0",