Update article.md

Added commas. "Later in the year" without commas at first suggests "later that same year" or "in the later part of the year" (like, say Autumn). It's clear from the context and all, but it reads easier this way.

Author: paroche

1-js/08-prototypes/04-prototype-methods/article.md

@@ -72,8 +72,8 @@ Why so?
 That's for historical reasons.
 
 - The `"prototype"` property of a constructor function works since very ancient times.
-- Later in the year 2012: `Object.create` appeared in the standard. It allowed to create objects with the given prototype, but did not allow to get/set it. So browsers implemented non-standard `__proto__` accessor that allowed to get/set a prototype at any time.
-- Later in the year 2015: `Object.setPrototypeOf` and `Object.getPrototypeOf` were added to the standard, to perform the same functionality as `__proto__`. As `__proto__` was de-facto implemented everywhere, it was kind-of deprecated and made its way to the Annex B of the standard, that is optional for non-browser environments.
+- Later, in the year 2012: `Object.create` appeared in the standard. It allowed to create objects with the given prototype, but did not allow to get/set it. So browsers implemented non-standard `__proto__` accessor that allowed to get/set a prototype at any time.
+- Later, in the year 2015: `Object.setPrototypeOf` and `Object.getPrototypeOf` were added to the standard, to perform the same functionality as `__proto__`. As `__proto__` was de-facto implemented everywhere, it was kind-of deprecated and made its way to the Annex B of the standard, that is optional for non-browser environments.
 
 As of now we have all these ways at our disposal.