Removed riot from the readme

The proposed change removes the section about Riot from the readme, RIot hasn't been touched for over 2 years, and the author has [abandoned the gem](thumblemonks/riot#52).

README.md

@@ -146,19 +146,6 @@ to use SimpleCov with them. Here's an overview of the known ones:
       <a href="https://github.com/colszowka/simplecov/pull/185">#185</a>
     </td>
   </tr>
-  <tr>
-    <th>
-      Riot
-    </th>
-    <td>
-      A user has reported problems with the coverage report using the riot
-      framework. If you experience similar trouble please follow up on the
-      related GitHub issue.
-    </td>
-    <td>
-      <a href="https://github.com/colszowka/simplecov/issues/80">#80</a>
-    </td>
-  </tr>
   <tr>
     <th>
       RubyMine