Add link to Product Hunt entry

sindresorhus · web-flow · commit 2df1e1509991 · 2017-05-13T17:51:05.000+07:00
diff --git a/readme.md b/readme.md
@@ -4,6 +4,8 @@
 
 Caprine is an unofficial and privacy focused Facebook Messenger app with many useful features.
 
+**[Discuss it on Product Hunt](https://www.producthunt.com/posts/caprine-2)**
+
 <br>
 
 <a href="https://github.com/sindresorhus/caprine/releases/latest">
