(blog spotify) Add GA snippet

Author: thewarpaint

_posts/2018-10-14-dear-spotify.html

@@ -73,5 +73,7 @@ <h2 class="subtitle">{{ postDescription }}</h2>
     <p>
       <a href="https://news.ycombinator.com/item?id=18212383">Follow the discussion on Hacker News</a>
     </p>
+
+    {%- include google-analytics.html -%}
   </body>
 </html>