test: fix require of multiplex

Author: dryajov

package.json

@@ -49,7 +49,6 @@
     "libp2p-webrtc-star": "~0.14.0",
     "libp2p-websockets": "~0.12.0",
     "peer-book": "~0.7.0",
-    "pre-commit": "^1.2.2",
     "pull-goodbye": "0.0.2",
     "sinon": "^5.0.1",
     "webrtcsupport": "^2.2.0"

test/stats.node.js

@@ -10,7 +10,7 @@ const each = require('async/each')
 const map = require('async/map')
 const series = require('async/series')
 const TCP = require('libp2p-tcp')
-const multiplex = require('libp2p-multiplex')
+const multiplex = require('libp2p-mplex')
 const pull = require('pull-stream')
 const secio = require('libp2p-secio')
 const PeerBook = require('peer-book')