feat(deps): update minimal version from 8 -> 12 (#152)

Author: etroynov

package.json

@@ -26,7 +26,7 @@
     "wrk": "^1.2.1"
   },
   "engines": {
-    "node": ">= 8.0.0"
+    "node": ">= 12"
   },
   "files": [
     "lib"