fix(package): update simple-websocket to version 7.0.1

Closes webtorrent#258

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "safe-buffer": "^5.0.0",
     "simple-get": "^2.0.0",
     "simple-peer": "^8.3.0",
-    "simple-websocket": "^6.0.0",
+    "simple-websocket": "^7.0.1",
     "string2compact": "^1.1.1",
     "uniq": "^1.0.1",
     "unordered-array-remove": "^1.0.2",