chore: convert plugin dependencies to peer dependencies (#58)

Author: ekashida

README.md

@@ -5,9 +5,11 @@
 ## Installation
 
 ```
-$ npm install eslint @salesforce/eslint-config-lwc --save-dev
+$ npm install --save-dev @salesforce/eslint-config-lwc @lwc/eslint-plugin-lwc eslint eslint-plugin-import eslint-plugin-jest
 ```
 
+Note that `@lwc/eslint-plugin-lwc`, `eslint`, `eslint-plugin-import`, and `eslint-plugin-jest` are peer dependencies of `@salesforce/eslint-config-lwc`.
+
 ## Usage
 
 Add the appropriate [configuration](#Configurations) to the `extends` field in your configuration.

package.json

@@ -19,20 +19,23 @@
   "dependencies": {
     "@babel/core": "~7.13.14",
     "@babel/eslint-parser": "~7.13.14",
-    "@lwc/eslint-plugin-lwc": "~1.0.0",
-    "eslint-plugin-import": "~2.22.1",
-    "eslint-plugin-jest": "~23.8.2",
     "eslint-restricted-globals": "~0.2.0"
   },
   "devDependencies": {
+    "@lwc/eslint-plugin-lwc": "~1.0.0",
     "eslint": "^7.22.0",
+    "eslint-plugin-import": "~2.22.1",
+    "eslint-plugin-jest": "~23.8.2",
     "husky": "^4.3.8",
     "lint-staged": "^10.5.4",
     "mocha": "^8.3.2",
     "prettier": "^2.2.1"
   },
   "peerDependencies": {
-    "eslint": "^6 || ^7"
+    "@lwc/eslint-plugin-lwc": "~1.0.0",
+    "eslint": "^6 || ^7",
+    "eslint-plugin-import": "~2.22.1",
+    "eslint-plugin-jest": "~23.8.2"
   },
   "repository": {
     "type": "git",