Mention buddy.js and ESLint for magic numbers

Author: danielstjules

README.md

@@ -72,7 +72,10 @@ getUser();
 We will read more code than we will ever write. It's important that the code we
 do write is readable and searchable. By *not* naming variables that end up
 being meaningful for understanding our program, we hurt our readers.
-Make your names searchable.
+Make your names searchable. Tools like
+[buddy.js](https://github.com/danielstjules/buddy.js) and
+[ESLint](https://github.com/eslint/eslint/blob/660e0918933e6e7fede26bc675a0763a6b357c94/docs/rules/no-magic-numbers.md)
+can help identify unnamed constants.
 
 **Bad:**
 ```javascript