Update to node 10 (#2912)

Update to node 10

Author: wagnerand

.nvmrc

@@ -1 +1 @@
-8.16.2
+10

.travis.yml

@@ -1,8 +1,8 @@
 language: node_js
 sudo: false
 node_js:
-  - '8'
   - '10'
+  - '12'
 script:
   - npm run test-ci
   - node scripts/build-locales

README.md

@@ -125,7 +125,7 @@ bin/addons-linter my-addon.zip
 
 ### Required Node version
 
-addons-linter requires Node.js v8 or greater. Have a look at our `.travis.yml` file which Node.js versions we officially test.
+addons-linter requires Node.js v10 or greater. Have a look at our `.travis.yml` file which Node.js versions we officially test.
 
 Using nvm is probably the easiest way to manage multiple Node versions side by side. See [nvm on GitHub](https://github.com/creationix/nvm) for more details.
 

package.json

@@ -6,6 +6,9 @@
   "bin": {
     "addons-linter": "bin/addons-linter"
   },
+  "engines": {
+    "node": ">=10.13"
+  },
   "scripts": {
     "build": "webpack --verbose --bail --display-error-details --progress --colors --config webpack.config.js",
     "eslint": "eslint bin/* scripts/* .",