Update puppeteer to the latest version 🚀 (#1286)

* chore(package): update puppeteer to version 1.20.0

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -94,7 +94,7 @@
     "null-loader": "^3.0.0",
     "parse-server": "github:parseplatform/parse-server#master",
     "path-to-regexp": "3.1.0",
-    "puppeteer": "1.19.0",
+    "puppeteer": "1.20.0",
     "react-test-renderer": "16.9.0",
     "request": "2.87.0",
     "request-promise": "4.2.4",