major: Require Node.js 8 or greater

chrisbreiding · chrisbreiding · commit ad88970447f2 · 2020-05-20T11:18:46.000-04:00
going to start using async/await, which requires Node.js 7.6+, so we’ll require the next stable version (8) or greater
diff --git a/package.json b/package.json
@@ -66,7 +66,7 @@
     "lib/*.js"
   ],
   "engines": {
-    "node": ">=6.5"
+    "node": ">=8"
   },
   "license": "MIT",
   "repository": {
