revert: node bump (#486)

Author: evilebottnawi

babel.config.js

@@ -10,7 +10,7 @@ module.exports = (api) => {
         '@babel/preset-env',
         {
           targets: {
-            node: '10.13.0',
+            node: '8.9.0',
           },
         },
       ],

package.json

@@ -13,7 +13,7 @@
   },
   "main": "dist/cjs.js",
   "engines": {
-    "node": ">= 10.13.0"
+    "node": ">= 8.9.0"
   },
   "scripts": {
     "start": "npm run build -- -w",