fix: convert README template usage to flat

plugin/templates/_README.md

@@ -18,23 +18,23 @@ npm install eslint-plugin-<%= pluginId %> --save-dev
 
 ## Usage
 
-Add `<%= pluginId %>` to the plugins section of your `.eslintrc` configuration file. You can omit the `eslint-plugin-` prefix:
+Add `<%= pluginId %>` to the `plugins` key of your [configuration file](https://eslint.org/docs/latest/use/configure/configuration-files#configuration-file). You can omit the `eslint-plugin-` prefix:
 
-```json
+```js
 {
-    "plugins": [
+    plugins: {
         "<%= pluginId %>"
-    ]
+    }
 }
 ```
 
 <% if (hasRules) { %>
-Then configure the rules you want to use under the rules section.
+Then configure the rules you want to use under the `rules` key.
 
-```json
+```js
 {
-    "rules": {
-        "<%= pluginId %>/rule-name": 2
+    rules: {
+        "<%= pluginId %>/rule-name": "warn"
     }
 }
 ```

tests/plugin/index.js

@@ -57,9 +57,9 @@ describe("ESLint Plugin Generator", () => {
             assert.fileContent("README.md", "# eslint-plugin-foo-bar");
             assert.fileContent("README.md", "Next, install `eslint-plugin-foo-bar`:");
             assert.fileContent("README.md", "npm install eslint-plugin-foo-bar --save-dev");
-            assert.fileContent("README.md", "Add `foo-bar` to the plugins section");
+            assert.fileContent("README.md", "Add `foo-bar` to the `plugins` key");
 
-            assert.noFileContent("README.md", "Then configure the rules you want to use under the rules section.");
+            assert.noFileContent("README.md", "Then configure the rules you want to use under the `rules` key.");
         });
 
         it("has correct lib/index.js", () => {
@@ -102,7 +102,7 @@ describe("ESLint Plugin Generator", () => {
         });
 
         it("has correct README.md", () => {
-            assert.fileContent("README.md", "\"foo-bar/rule-name\": 2");
+            assert.fileContent("README.md", "\"foo-bar/rule-name\": \"warn\"");
         });
     });