chore(deps): update CI config for Node bump

Author: chriskrycho

.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

appveyor.yml

@@ -7,7 +7,7 @@ init:
 # Test against these versions of Node.js.
 environment:
   matrix:
-    - nodejs_version: "8"
+    - nodejs_version: "10"
 
 # Install scripts. (runs after repo cloning)
 install:

azure-pipelines.yml

@@ -14,7 +14,7 @@ trigger:
 steps:
   - task: NodeTool@0
     inputs:
-      versionSpec: '8.x'
+      versionSpec: '10.x'
     displayName: 'Install Node.js'
 
   - script: |

package.json

@@ -81,5 +81,8 @@
     "trailingComma": "es5",
     "tabWidth": 2,
     "proseWrap": "never"
+  },
+  "volta": {
+    "node": "10.23.0"
   }
 }