Use projectService instead of manual project path (#16)

The project service[1] auto-detects the appropriate tsconfig.json for
each file being linted, using the same TypeScript APIs that editors/IDEs
use. This removes the need for consumers to have a tsconfig.json at
a specific path relative to the working directory.

[1] https://typescript-eslint.io/blog/project-service/

Author: jstasiak

index.js

@@ -11,8 +11,7 @@ module.exports = {
     ],
     parser: '@typescript-eslint/parser',
     parserOptions: {
-        // Needed for the typescript-eslint type-based linting rules
-        project: ['./tsconfig.json'],
+        projectService: true,
     },
     plugins: ['@typescript-eslint', 'n', 'simple-import-sort'],
     rules: {