Dependency updates (#4)

* chore: Add eslint-plugin-ember as a peer dependency

Without the user having this installed, it is possible to trigger `Definition for rule 'rule-name' was not found`

* chore: Don't extend `@bagaar/eslint-config`

BREAKING CHANGE: Since `@bagaar/eslint-config-ember` does not override any rules of `@bagaar/eslint-config`, extending has no real benefit besides not having to include `@bagaar/eslint-config` inside a project's extends.
Removing the extend also has the benefit that we can switch out the ESLint specific config without having to change this library.

* chore: Update the README

Remove references to `@bagaar/eslint-config-ember` and add a note about the eslint-plugin-ember dependency.

README.md

@@ -10,18 +10,18 @@ EsLint config for Bagaar Ember addons and projects.
 
 ## Installation
 
-⚠️ **`@bagaar/eslint-config-ember` depends on `@bagaar/eslint-config`. Make sure to install `@bagaar/eslint-config` as well.**
+⚠️ **`@bagaar/eslint-config-ember` overrides rules provided by the [`ember-plugin-eslint`](https://github.com/ember-cli/eslint-plugin-ember) plugin. Make sure it is installed and configured properly.**
 
 ### npm
 
 ```shell
-npm install @bagaar/eslint-config @bagaar/eslint-config-ember --save-dev
+npm install @bagaar/eslint-config-ember --save-dev
 ```
 
 ### yarn
 
 ```shell
-yarn add @bagaar/eslint-config @bagaar/eslint-config-ember --dev
+yarn add @bagaar/eslint-config-ember --dev
 ```
 
 ## Usage

lib/index.js

@@ -1,7 +1,4 @@
 module.exports = {
-  extends: [
-    '@bagaar/eslint-config',
-  ],
   rules: {
     'ember/alias-model-in-controller': 'error',
     'ember/avoid-leaking-state-in-components': 'error',

package.json

@@ -23,5 +23,8 @@
     "eslint": "^5.12.1",
     "eslint-plugin-ember": "^6.2.0",
     "standard-version": "^4.4.0"
+  },
+  "peerDependencies": {
+    "eslint-plugin-ember": "^6.2.0"
   }
 }

tests/.eslintrc.js

@@ -10,6 +10,7 @@ module.exports = {
   extends: [
     'eslint:recommended',
     'plugin:ember/recommended',
+    '@bagaar/eslint-config',
     '../lib/index.js',
   ],
   env: {