chore(package): update puppeteer to version 2.1.0

Closes #192

Author: greenkeeper[bot]

package.json

@@ -91,7 +91,7 @@
     "mocha": "^5.0.0",
     "nodemon": "^1.14.12",
     "prettier": "^1.9.2",
-    "puppeteer": "^1.2.0",
+    "puppeteer": "^2.1.0",
     "raf": "^3.4.0"
   },
   "lint-staged": {