hardcode node engines

Author: barelyhuman

package.json

@@ -4,6 +4,9 @@
 	"main": "./dist/index.js",
 	"module": "./dist/index.mjs",
 	"types": "./dist/index.d.ts",
+	"engines": {
+		"node": ">=12"
+	},
 	"exports": {
 		"./package.json": "./package.json",
 		".": {