Remove unused deps

Author: pluma

package.json

@@ -49,15 +49,13 @@
     "linkedlist": "1.0.1"
   },
   "devDependencies": {
-    "async": "1.5.0",
     "babel": "5.8.34",
     "babel-eslint": "4.1.6",
     "babelify": "6.4.0",
     "browserify": "12.0.1",
     "chai": "3.4.1",
     "core-js": "1.2.6",
     "coveralls": "2.11.4",
-    "dekeywordify": "0.2.1",
     "eslint": "1.10.2",
     "istanbul": "0.4.1",
     "mocha": "2.3.4",