fix: remove greenkeeper badge

README.md

@@ -7,7 +7,6 @@ test helpers for oclif components
 [![CircleCI](https://circleci.com/gh/oclif/test/tree/master.svg?style=svg)](https://circleci.com/gh/oclif/test/tree/master)
 [![Appveyor CI](https://ci.appveyor.com/api/projects/status/github/oclif/test?branch=master&svg=true)](https://ci.appveyor.com/project/heroku/test/branch/master)
 [![Codecov](https://codecov.io/gh/oclif/test/branch/master/graph/badge.svg)](https://codecov.io/gh/oclif/test)
-[![Greenkeeper](https://badges.greenkeeper.io/oclif/test.svg)](https://greenkeeper.io/)
 [![Known Vulnerabilities](https://snyk.io/test/npm/@oclif/test/badge.svg)](https://snyk.io/test/npm/@oclif/test)
 [![Downloads/week](https://img.shields.io/npm/dw/@oclif/test.svg)](https://npmjs.org/package/@oclif/test)
 [![License](https://img.shields.io/npm/l/@oclif/test.svg)](https://github.com/oclif/test/blob/master/package.json)