Build: Remove greenkeeper from config and README

We use dependabot instead of greenkeeper now

Author: markusguenther

README.md

@@ -8,9 +8,6 @@
   <a href="https://travis-ci.org/FriendsOfReactJS/react-css-themr">
     <img alt="Travis CI Build Status" src="https://img.shields.io/travis/FriendsOfReactJS/react-css-themr/master.svg?style=flat-square&label=Travis+CI">
   </a>
-  <a href="https://greenkeeper.io">
-    <img alt="We use greenkeeper" src="https://badges.greenkeeper.io/FriendsOfReactJS/react-css-themr.svg?style=flat-square">
-  </a>
   <a href="https://github.com/prettier/prettier">
     <img alt="code style: prettier" src="https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square">
   </a>

package.json

@@ -92,26 +92,6 @@
       "path": "./node_modules/cz-adapter-eslint"
     }
   },
-  "greenkeeper": {
-    "commitMessages": {
-      "initialBadge": "Docs: add Greenkeeper badge",
-      "initialDependencies": "Upgrade: update dependencies",
-      "initialBranches": "Update: whitelist greenkeeper branches",
-      "dependencyUpdate": "Fix: update ${dependency} to version ${version}",
-      "devDependencyUpdate": "Upgrade: update ${dependency} to version ${version}",
-      "dependencyPin": "Update: pin ${dependency} to ${oldVersionResolved}",
-      "devDependencyPin": "Update: pin ${dependency} to ${oldVersionResolved}",
-      "closes": "\n\nCloses #${number}"
-    },
-    "prTitles": {
-      "initialPR": "Update dependencies to enable Greenkeeper!!!",
-      "initialPrBadge": "Add badge to enable Greenkeeper!!!!",
-      "initialPrBadgeOnly": "Add Greenkeeper badge!!!",
-      "initialSubgroupPR": "Update dependencies for ${group}!!!",
-      "basicPR": "Update ${dependency} to the latest!!!",
-      "groupPR": "Update ${dependency} in group ${group} to the latest!!!!"
-    }
-  },
   "publishConfig": {
     "access": "public"
   }