feat: semi error never

[4www]

Closes https://github.com/peopledoc/eslint-config-peopledoc/issues/15

In this PR:

• new rule to remove the semicolons ; enforcement; following https://github.com/peopledoc/eslint-config-peopledoc/issues/15.
• .editorconfig file added, copied from ember-data-peopledoc

Tested on a peopledoc project, and it seems to work without issue.

Further readings on semi or not:

• https://eslint.org/docs/rules/semi#require-or-disallow-semicolons-instead-of-asi-semi
• http://blog.izs.me/post/2353458699/an-open-letter-to-javascript-leaders-regarding
• http://inimino.org/~inimino/blog/javascript_semicolons

How to implement?

• current version is 1.3.0, how big of a change is it? 1.4.0 or 1.3.1 maybe?

To make the transition from semi, to no-semi, this script can be be helpful.

Add it to the script section of your projects package.json, and update this module to the version that will be released:

// package.json
{
[...]
  "scripts": {
    "prettier": "./node_modules/.bin/prettier-eslint --write --single-quote {app,config,mirage,lib,server,tests}/{**/,}*.js"
  }
[...]
  {
    devDependencies: {
      "eslint-config-peopledoc": "github:peopledoc/eslint-config-peopledoc#v1.4.0",
    }
  }
[...]
}

And then run npm run prettier, to clean all semicolons from your javascript files.

[edouard-lopez]

@hugurp :+1:
Might be good to add the How to implement? section to the release note for 1.4.0 so other team don't have to dive into issues to find how to do it