removed unused dep setprototypeof

Author: jonchurch

index.js

@@ -13,7 +13,6 @@
  */
 
 var deprecate = require('depd')('http-errors')
-var setPrototypeOf = require('setprototypeof')
 var statuses = require('statuses')
 var inherits = require('inherits')
 var toIdentifier = require('toidentifier')

package.json

@@ -12,7 +12,6 @@
   "dependencies": {
     "depd": "2.0.0",
     "inherits": "2.0.4",
-    "setprototypeof": "1.2.0",
     "statuses": "2.0.1",
     "toidentifier": "1.0.1"
   },