fix(package): update pino to version 4.7.1

Closes #87

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "express-handlebars": "3.0.0",
     "passport": "0.3.2",
     "passport-local": "1.0.0",
-    "pino": "4.6.0",
+    "pino": "4.7.1",
     "request": "2.81.0",
     "request-promise": "4.2.1",
     "tough-cookie": "2.3.2",