feat: use dependabot over greenkeeper

Greenkeeper CLI is defunct so switching to Dependabot as Greg suggested.

.github/workflows/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 5
+  target-branch: master
+  # reviewers:
+  # - Berkmann18
+  # - RichardLitt
+  labels:
+  - dependencies

.github/workflows/nodejs.yml

@@ -21,14 +21,11 @@ jobs:
       with:
         node-version: ${{ matrix.node-version }}
     - run: |
-        npm i -g greenkeeper-lockfile@1
         npm prune
-        greenkeeper-lockfile-update
 
     - run: |
         npm ci
         npm run lint
-    - run: greenkeeper-lockfile-upload
     - run: npm t
       env:
         CI: true

readme.md

@@ -1,8 +1,8 @@
 # name-your-contributors
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/mntnr/name-your-contributors.svg)](https://greenkeeper.io/)
 [![npm version](https://badge.fury.io/js/name-your-contributors.svg)](https://badge.fury.io/js/name-your-contributors)
 [![Build Status](https://travis-ci.org/mntnr/name-your-contributors.svg?branch=master)](https://travis-ci.org/mntnr/name-your-contributors)
+[![Build and Deploy](https://github.com/mntnr/name-your-contributors/actions/workflows/nodejs.yml/badge.svg)](https://github.com/mntnr/name-your-contributors/actions/workflows/nodejs.yml)
 [![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
 
 > Name your GitHub contributors; get commits, issues, and comments