fix: allow higher pino versions (#30)

Author: flofehrenbacher-sz

package.json

@@ -56,7 +56,7 @@
     "typescript": "^4.1.3"
   },
   "peerDependencies": {
-    "pino": "^6.0.0"
+    "pino": ">=6.0.0 <8.0.0"
   },
   "prettier": {
     "arrowParens": "always",