Fix ruby prize 2017 title (pt)

Author: gentilfp

pt/news/_posts/2017-07-21-ruby-prize-2017.md

@@ -1,6 +1,6 @@
 ---
 layout: news_post
-title: "Nominations now being accepted for Ruby Prize 2017"
+title: "Nomeações para Ruby Prize 2017 estão abertas"
 author: "Ruby Association"
 translator: "fgentil"
 date: 2017-07-21 00:00:00 +0000