added maintainability badge by code climate

.travis.yml

@@ -1,25 +1,12 @@
 language: node_js
 node_js:
   - 12
-dist: trusty
-addons:
-  chrome: stable
 branches:
   only:
     - master
 cache:
   directories:
     - node_modules
-before_script:
-  - yarn global add nyc
-  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
-  - chmod +x ./cc-test-reporter
-  - ./cc-test-reporter before-build
 script:
   - yarn test
   - yarn coveralls
-  - nyc --reporter=lcov yarn coverage
-after_script:
-  - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT
-notifications:
-  email: false

README.md

@@ -1,6 +1,6 @@
 # vuex-hooks
 
-[![Build Status](https://travis-ci.org/Goldziher/vuex-hooks.svg?branch=master)](https://travis-ci.org/Goldziher/vuex-hooks) [![Coverage Status](https://coveralls.io/repos/github/Goldziher/vuex-hooks/badge.svg?branch=master)](https://coveralls.io/github/Goldziher/vuex-hooks?branch=master) [![npm version](https://badge.fury.io/js/vuex-hooks.svg)](https://badge.fury.io/js/vuex-hooks)
+[![Build Status](https://travis-ci.org/Goldziher/vuex-hooks.svg?branch=master)](https://travis-ci.org/Goldziher/vuex-hooks) [![Coverage Status](https://coveralls.io/repos/github/Goldziher/vuex-hooks/badge.svg?branch=master)](https://coveralls.io/github/Goldziher/vuex-hooks?branch=master) [![npm version](https://badge.fury.io/js/vuex-hooks.svg)](https://badge.fury.io/js/vuex-hooks) [![Maintainability](https://api.codeclimate.com/v1/badges/de1f807703330e29c31f/maintainability)](https://codeclimate.com/github/Goldziher/vuex-hooks/maintainability)
 
 This tiny package offers TypeScript enabled vuex composition-api hooks, closing the gap between [vuex](https://github.com/vuejs/vuex) and the [@vue/composition-api](https://github.com/vuejs/composition-api).