chore: configure Prettier to avoid arrow parentheses

Author: jrolfs

prettier.config.js

@@ -3,5 +3,6 @@ module.exports = {
   singleQuote: true,
   trailingComma: 'all',
   semi: false,
-  printWidth: 100
-};
+  printWidth: 100,
+  arrowParens: 'avoid'
+}