Use the Chart.js shared ESLint config (#5112)

An ESLint shareable config has been created (from this repository) in the attempt to homogenize Chart.js hosted projects and plugins style. Rename `.eslintrc` files to `.eslintrc.yml` since the name has been deprecated.

Fix the CC badge (maintainability) and disable CodeClimate ESLint plugin because it doesn't support custom shareable config but also because it already executes relevant checks as part of the regular process.

.codeclimate.yml

@@ -1,25 +1,19 @@
-engines:
+version: "2"
+plugins:
   duplication:
     enabled: true
     config:
       languages:
-      - javascript
-  eslint:
-    enabled: true
-    channel: "eslint-4"
+        - javascript
   fixme:
     enabled: true
-ratings:
-  paths:
-  - "src/**/*.js"
-exclude_paths:
-- '.github/'
-- 'dist/'
-- 'test/'
-- 'docs/'
-- 'samples/'
-- 'scripts/'
-- '**.md'
-- '**.json'
-- 'gulpfile.js'
-- 'karma.conf.js'
+exclude_patterns:
+  - "dist/"
+  - "docs/"
+  - "samples/"
+  - "scripts/"
+  - "test/"
+  - "*.js"
+  - "*.json"
+  - "*.md"
+  - ".*"

.eslintrc.yml

@@ -0,0 +1,5 @@
+extends: chartjs
+
+env:
+  browser: true
+  node: true

README.md

@@ -1,6 +1,6 @@
 # Chart.js
 
-[![travis](https://img.shields.io/travis/chartjs/Chart.js.svg?style=flat-square&maxAge=60)](https://travis-ci.org/chartjs/Chart.js) [![codeclimate](https://img.shields.io/codeclimate/github/chartjs/Chart.js.svg?style=flat-square&maxAge=600)](https://codeclimate.com/github/chartjs/Chart.js) [![coveralls](https://img.shields.io/coveralls/chartjs/Chart.js.svg?style=flat-square&maxAge=600)](https://coveralls.io/github/chartjs/Chart.js?branch=master) [![slack](https://img.shields.io/badge/slack-Chart.js-blue.svg?style=flat-square&maxAge=3600)](https://chart-js-automation.herokuapp.com/)
+[![travis](https://img.shields.io/travis/chartjs/Chart.js.svg?style=flat-square&maxAge=60)](https://travis-ci.org/chartjs/Chart.js) [![coveralls](https://img.shields.io/coveralls/chartjs/Chart.js.svg?style=flat-square&maxAge=600)](https://coveralls.io/github/chartjs/Chart.js?branch=master) [![codeclimate](https://img.shields.io/codeclimate/maintainability/chartjs/Chart.js.svg?style=flat-square&maxAge=600)](https://codeclimate.com/github/chartjs/Chart.js) [![slack](https://img.shields.io/badge/slack-Chart.js-blue.svg?style=flat-square&maxAge=3600)](https://chart-js-automation.herokuapp.com/)
 
 *Simple HTML5 Charts using the canvas element* [chartjs.org](http://www.chartjs.org)
 

package.json

@@ -16,6 +16,7 @@
     "child-process-promise": "^2.2.1",
     "coveralls": "^3.0.0",
     "eslint": "^4.9.0",
+    "eslint-config-chartjs": "git+https://github.com/chartjs/eslint-config-chartjs.git",
     "gitbook-cli": "^2.3.2",
     "gulp": "3.9.x",
     "gulp-concat": "~2.6.x",