only support node 10 and up

Author: bcherny

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [4.5.0, 6.x, 8.x, 10.x, 12.x, 13.x]
+        node-version: [10.x, 12.x, 13.x]
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:

package.json

@@ -8,7 +8,7 @@
   },
   "typings": "dist/src/index.d.ts",
   "engines": {
-    "node": ">=4.5.0"
+    "node": ">=10.0.0"
   },
   "scripts": {
     "build": "npm run clean && mkdir dist && npm run build:browser && npm run build:server",