chore: drop support for node 8

BREAKING CHANGE: drops suppoprt to node 8 and updates linting rules

Author: ghermeto

.eslintrc.js

@@ -9,7 +9,10 @@ var config = {
     env: {
         browser: false,
         node: true,
-        es6: false
+        es6: true
+    },
+    parserOptions: {
+        ecmaVersion: 2018
     },
     rules: {}
 };

package.json

@@ -90,7 +90,7 @@
     "report-latency": "./bin/report-latency"
   },
   "engines": {
-    "node": ">=8.3.0"
+    "node": ">=10.21.0"
   },
   "dependencies": {
     "assert-plus": "^1.0.0",