ci: add node 8 and 9 to CI configs

Author: zkat

.travis.yml

@@ -1,6 +1,8 @@
 language: node_js
 sudo: false
 node_js:
+  - "9"
+  - "8"
   - "7"
   - "6"
   - "4"

README.md

@@ -1,6 +1,6 @@
-# npm-lifecycle [![npm version](https://img.shields.io/npm/v/npm-lifecycle.svg)](https://npm.im/npm-lifecycle) [![license](https://img.shields.io/npm/l/npm-lifecycle.svg)](https://npm.im/npm-lifecycle) [![Travis](https://img.shields.io/travis/npm/lifecycle.svg)](https://travis-ci.org/npm/lifecycle) [![AppVeyor](https://ci.appveyor.com/api/projects/status/github/npm/lifecycle?svg=true)](https://ci.appveyor.com/project/npm/lifecycle) [![Coverage Status](https://coveralls.io/repos/github/npm/lifecycle/badge.svg?branch=latest)](https://coveralls.io/github/npm/lifecycle?branch=latest)
+# npm-lifecycle [![npm version](https://img.shields.io/npm/v/npm-lifecycle.svg)](https://npm.im/npm-lifecycle) [![license](https://img.shields.io/npm/l/npm-lifecycle.svg)](https://npm.im/npm-lifecycle) [![Travis](https://img.shields.io/travis/npm/npm-lifecycle.svg)](https://travis-ci.org/npm/npm-lifecycle) [![AppVeyor](https://ci.appveyor.com/api/projects/status/github/npm/npm-lifecycle?svg=true)](https://ci.appveyor.com/project/npm/npm-lifecycle) [![Coverage Status](https://coveralls.io/repos/github/npm/npm-lifecycle/badge.svg?branch=latest)](https://coveralls.io/github/npm/npm-lifecycle?branch=latest)
 
-[`npm-lifecycle`](https://github.com/npm/lifecycle) is a standalone library for
+[`npm-lifecycle`](https://github.com/npm/npm-lifecycle) is a standalone library for
 executing packages' lifecycle scripts. It is extracted from npm itself and
 intended to be fully compatible with the way npm executes individual scripts.
 

appveyor.yml

@@ -1,5 +1,7 @@
 environment:
   matrix:
+    - nodejs_version: "9"
+    - nodejs_version: "8"
     - nodejs_version: "7"
     - nodejs_version: "6"
     - nodejs_version: "4"