test: fiber requires node 10 or higher

Author: webark

.travis.yml

@@ -3,7 +3,7 @@ language: node_js
 node_js:
   # we recommend testing addons with the same minimum supported node version as Ember CLI
   # so that your addon works for all apps
-  - "8"
+  - "10"
 
 sudo: false
 dist: trusty

package.json

@@ -65,7 +65,7 @@
     "standard-version": "^6.0.1"
   },
   "engines": {
-    "node": "8.* || >= 10.*"
+    "node": ">= 10.*"
   },
   "ember-addon": {
     "configPath": "tests/dummy/config"