Merge pull request webtorrent#325 from webtorrent/greenkeeper/bn.js-5.0.0

Update bn.js to the latest version 🚀

Author: feross

package.json

@@ -22,7 +22,7 @@
   "dependencies": {
     "bencode": "^2.0.0",
     "bittorrent-peerid": "^1.0.2",
-    "bn.js": "^4.4.0",
+    "bn.js": "^5.0.0",
     "compact2string": "^1.2.0",
     "debug": "^4.0.1",
     "ip": "^1.0.1",