docs: update eslint pattern matching (#851)

README.md

@@ -99,7 +99,7 @@ module.exports = {
 	overrides: [
 		{
 			// 3) Now we enable eslint-plugin-testing-library rules or preset only for matching testing files!
-			files: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[jt]s?(x)'],
+			files: ['**/__tests__/**/*.[jt]sx?', '**/?(*.)+(spec|test).[jt]sx?'],
 			extends: ['plugin:testing-library/react'],
 		},
 	],