chore(package): update pino to version 6.2.0

Closes #13

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "@types/pino": "^5.6.0",
     "jest": "^23.6.0",
     "lerna": "^3.4.0",
-    "pino": "^5.6.2",
+    "pino": "^6.2.0",
     "ts-jest": "^24.0.0",
     "typescript": "^3.1.1"
   }