chore: bumps the required "node" version to v10.18

BREAKING CHANGE: Please use "node >= v10.18" to use Gavel

Author: artem-zakharchenko

package.json

@@ -5,7 +5,7 @@
   "main": "build/index.js",
   "typings": "typings.d.ts",
   "engines": {
-    "node": ">= 8"
+    "node": ">= 10.18"
   },
   "bin": {
     "gavel": "bin/gavel"