fix: upgrade node engines

Gcaufy · Gcaufy · commit dfac7d85ab0f · 2019-10-21T15:15:13.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 
 node_js:
-  - "6"
+  - "8"
 
 matrix:
   include:
diff --git a/package.json b/package.json
@@ -100,6 +100,9 @@
     }
   },
   "dependencies": {},
+  "engines": {
+    "node": ">=8.9.4"
+  },
   "husky": {
     "hooks": {
       "pre-commit": "npm run test",
