Install prettier as dev dependency (#14)

Author: chaance

.eslintrc.cjs

@@ -1,8 +1,8 @@
 module.exports = {
   root: true,
   extends: [
-		'eslint:recommended',
-		'prettier',
+    'eslint:recommended',
+    'prettier',
     'plugin:@typescript-eslint/recommended',
     'plugin:require-extensions/recommended',
   ],