fix: fix ci configs, update readme

Author: borodayev

.travis.yml

@@ -12,8 +12,9 @@ node_js:
   - "8"
 before_install:
   - yarn global add greenkeeper-lockfile@1
-  - yarn add mongoose
-before_script: greenkeeper-lockfile-update
+before_script: 
+  - greenkeeper-lockfile-update
+  - yarn add --peer mongoose
 after_script: greenkeeper-lockfile-upload
 script:
   - yarn run test

README.md

@@ -1,5 +1,13 @@
 # mongoose-history-diff :rocket: :fire:
 
+[![travis build](https://img.shields.io/travis/FrankAst/mongoose-history-diff.svg)](https://travis-ci.org/FrankAst/mongoose-history-diff)
+[![codecov coverage](https://img.shields.io/codecov/c/github/FrankAst/mongoose-history-diff.svg)](https://codecov.io/github/FrankAst/mongoose-history-diff)
+[![](https://img.shields.io/npm/v/mongoose-history-diff.svg)](https://www.npmjs.com/package/@frankast/mongoose-history-diff)
+[![npm](https://img.shields.io/npm/dt/mongoose-history-diff.svg)](http://www.npmtrends.com/mongoose-history-diff)
+[![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
+[![Greenkeeper badge](https://badges.greenkeeper.io/FrankAst/mongoose-history-diff.svg)](https://greenkeeper.io/)
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
+
 
 This is a [mongoose](https://mongoosejs.com/) plugin for tracking history and differences of your docs.