Merge pull request #337 from tillig/patch-1

`engines` block to specify min requirements

Author: tschaub

package.json

@@ -48,5 +48,8 @@
     "mocha": "^8.4.0",
     "rimraf": "^3.0.2",
     "semver": "^7.3.5"
+  },
+  "engines": {
+    "node": ">=12.0.0"
   }
 }