[meta] add missing engines.node

Author: ljharb

package.json

@@ -37,5 +37,8 @@
     "hash-test-vectors": "^1.3.2",
     "safe-buffer": "^5.2.1",
     "tape": "^5.9.0"
+  },
+  "engines": {
+    "node": ">= 0.8"
   }
 }