Drop support for Polymer 2 applications (#43)

* Drop support for Polymer 2 applications and Node 12

As FCNC has migrated their application to use the lit-html config, we don't need to support anymore this deprecated configuration.

README.md

@@ -39,7 +39,7 @@ module.exports = {
 ```json
 {
   "scripts": {
-    "format": "eslint . --ext js,json,md --fix",
+    "format": "npm run lint -- --fix",
     "lint": "eslint . --ext js,json,md"
   }
 }
@@ -54,11 +54,8 @@ module.exports = {
   // Extends the UdeS ESLint config for lit-html application
   extends: 'eslint-config-udes/lit-html',
 
-  // Extends the UdeS ESLint config for Polymer 2 application
-  extends: 'eslint-config-udes/polymer-2',
-
-  // Extends the UdeS ESLint config for Node.js 12 application
-  extends: 'eslint-config-udes/node-12',
+  // Extends the UdeS ESLint config for Node.js 16 application
+  extends: 'eslint-config-udes/node-16',
 
   // Extends the UdeS ESLint config for React application and element
   extends: 'eslint-config-udes/react',
@@ -67,15 +64,12 @@ module.exports = {
 
 #### Installation
 
-As these extends use other plugins, you may need to install additionnal devDependencies:
+As these configurations use other plugins, you may need to install additional devDependencies:
 
 ```bash
 # lit-html
 npm install babel-eslint eslint-plugin-html eslint-plugin-lit --save-dev
 
-# Polymer 2
-npm install eslint-plugin-html --save-dev
-
 # React
 npm install eslint-plugin-react --save-dev
 ```

package.json

@@ -1,6 +1,6 @@
 {
   "name": "eslint-config-udes",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "description": "ESLint shareable config for the UdeS JavaScript style guide",
   "keywords": [
     "check",
@@ -37,9 +37,8 @@
   "files": [
     "index.js",
     "lit-html.js",
-    "node-12.js",
     "node-14.js",
-    "polymer-2.js",
+    "node-16.js",
     "react.js"
   ],
   "scripts": {