chore: update node version in travis

.travis.yml

@@ -6,9 +6,7 @@ cache:
 notifications:
   email: false
 node_js:
-  - '7'
-before_install:
-  - npm i -g npm@^3.0.0
+  - '8'
 before_script:
   - npm prune
 after_success:

readme.md

@@ -1,10 +1,9 @@
 # Koa Proxies
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/vagusX/koa-proxies.svg)](https://greenkeeper.io/)
-
 ![NPM](https://img.shields.io/npm/v/koa-proxies.svg)
 [![Build Status](https://travis-ci.org/vagusX/koa-proxies.svg)](https://travis-ci.org/vagusX/koa-proxies)
 [![NPM Downloads](https://img.shields.io/npm/dm/localeval.svg)](https://www.npmjs.com/package/koa-proxies)
+[![Greenkeeper badge](https://badges.greenkeeper.io/vagusX/koa-proxies.svg)](https://greenkeeper.io/)
 
 > [[email protected]/next](https://github.com/koajs/koa) middlware for http proxy